Diplazium Swartz 1801
Creators: name: Pongkai, Puttamon
name: Zhang, Li-Bing
name: Boonkerd, Thaweesakdi
name: Pollawatn, Rossarin
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Polypodiopsida
Polypodiales
Athyriaceae
Diplazium

description: Key to the species of Diplazium in Thailand
1a Fronds simple .....................................................................................................................................................................................2
1b Fronds compound ...............................................................................................................................................................................3
2a Lamina cordate; scale margins entire ...................................................................................................................... 4. D. cordifolium
2b Lamina oblong; scale margins toothed................................................................................................................. 27. D. subserratum
3a Fronds unipinnate ...............................................................................................................................................................................4
3b Fronds bipinnate ...............................................................................................................................................................................23
4a Rhizome creeping...............................................................................................................................................................................5
4b Rhizome erect.....................................................................................................................................................................................8
5a Upper pinnae not reduced; terminal pinna distinct…………………………………………….........................................................6
5b Upper pinnae gradually reduced; terminal pinna not distinct……………………………........ ........................................................7
6a Terminal pinna simple ................................................................................................................................................ 6. D. donianum
6b Terminal pinna pinnatifid .................................................................................................................................... 29. D. thailandicum
7a Veinlets simple or once forked, 3–4 pairs; sori cresentic, 2–3 mm long.......................................................................... 18. D. petrii
7b Veinlets all free, 4–5 pairs; sori elongate along vein, 4–5 mm long ................................................................... 13. D. mettenianum
8a Scales entire........................................................................................................................................................................................9
8b Scales toothed...................................................................................................................................................................................12
9a Terminal pinna not distinct...............................................................................................................................................................10
9b Terminal pinna distinct .....................................................................................................................................................................19
10a Stipes and rachis tomentose................................................................................................................................... 30. D. tomentosum
10b Stipes and rachis glabrous ................................................................................................................................................................11
11a Auricle at basiscopic base of pinnule distinct; pinnae-stalks 4–5 mm long…..…….……..……................................ 14. D. mixtum
11b Auricle not distinct; pinnae-stalks less than 3 mm long............................................................................................... 9. D. holttumii
12a Terminal pinna distinct .....................................................................................................................................................................13
12b Terminal pinna not distinct...............................................................................................................................................................15
13a Lateral pinnae 10–15 pairs; terminal pinna subdeltoid, unlike lateral pinnae; lobed at margin.......................................................14
13b Lateral pinnae 3–5 pairs; terminal pinna similar to lateral one, entire at margin.................................................... 1. D. bantamense
14b Veins anastomosing; pinnae subentire to crenate at margin; gemmae absent .................................................... 12. D. megaphyllum
14b Veins free; pinnae serrate at margin; gemmae usually present between rachis and pinnae .................................... 22. D. proliferum
15a Veins all free .....................................................................................................................................................................................16
15b Veins anastomosing .................................................................................................................................................. 7. D. esculentum
16a Pinnae subentire or crenate at margin; auricle present at acroscopic base.......................................................................................17
16b Pinnae lobed at margin; auricle absent…….....................................................................................................................................18
17a Veinlets 1–2 pairs; pinnules 2.5–4 cm broad; distinctly auricled at base................................................................ 19. D. phanerotis
17b Veinlets 3–4 pairs; pinnules 1–1.5 cm broad; moderately auricled at base ............................................................ 28. D. sylvaticum
1 ∗ Following floristic format, references like this are not listed in References but can be found in Tropicos or IPNI.
18a Pinnae suddenly becoming smaller upwards, stalks up to 2 cm long ....................................................................... 23. D. siamense
18b Pinnae gradually becoming smaller upwards, stalks less than 0.5 cm long........................................................ 25. D. sorzogonense
19a Lateral pinnae more than 10 pairs; pinnae 2 cm wide; veins all free ...............................................................................................20
19b Lateral pinnae less than 7 pairs; pinnae more than 3 cm wide; veins anastomosing .......................................................................21
20a Veinlets 1 pairs, stalks 1–2 mm long.......................................................................................................................... 16. D. pallidum
20b Veinlets more than 1 pairs, stalks more than 3 mm long...................................................................................... 26. D. subintegrum
21a Pinnae ovate-lanceolate, long acuminate at apex, obtuse at base; gemmae usually present at junction between rachis and base of pinnae ...................................................................................................................................................................... 4. D. cordifolium
21b Pinnae oblong, acuminate at apex, acute at base; gemmae absent………………….…..................................................................22
22a Fronds less than 40 cm long; pinnae 2–4 pairs...................................................................................................... 8. D. fraxinifolium
22b Fronds up to 60 cm long; pinnae 4–7 pairs ........................................................................................................ 31. D. xiphophyllum
23a Rhizome creeping ............................................................................................................................................................................25
23b Rhizome erect or ascending..............................................................................................................................................................27
24a Scales with black margin....................................................................................................................................... 3. D. conterminum
24b Scales concolorous ...........................................................................................................................................................................25
25a Sori curved or cresentic usually lie on acroscopic veinlets of vein group .......................................................................................26
25b Sori oblong, usually lie on all veinlets .................................................................................................................. 21. D. procumbens
26a Sori submarginal, 2–3.5 mm long .................................................................................................................................... 18. D. petrii
26b Sori close to costule, 3–5 mm long ..................................................................................................................... 11. D. leptophyllum
27a Scales with black margins ...............................................................................................................................................................28
27b Scales with no black margins ..........................................................................................................................................................33
28a Sori oblong, usually less than 3 mm long.........................................................................................................................................29
28b Sori linear, usually more than 5 mm long .......................................................................................................................................30
29a Sori close to midrib of lobe ................................................................................................................................ 19. D. polypodioides
29b Sori medial between margin and midrib of lobe ................................................................................................... 10. D. kappanense
30a Veins free; pinnules lobed at margin ...............................................................................................................................................31
30b Veins anastomosing; pinnules subentire at margin................................................................................................... 7. D. esculentum
31a Pinnule sessile, base subtruncate to truncate....................................................................................................................................32
31b Pinnules stalked, base minutely cordate...................................................................................................................... 5. D. dilatatum
32a Pinnules crenate to lobe at margin, apexlong-acuminate ................................................................................. 24. D. simplicivenium
32b Pinnules subentire to serrate at margin, apex acute to acuminate ................................................................................ 17. D. petelotii
33a Pinnae and pinnule subopposite to opposite; sori close to costule.................................................................................. 2. D. bellum
33b Pinnae and pinnule alternate; sori not close to costule............................................................................................ 15. D. muricatum
description: Published as part of Pongkai, Puttamon, Zhang, Li-Bing, Boonkerd, Thaweesakdi & Pollawatn, Rossarin, 2023, Revision of the fern genus Diplazium (Polypodiales: Athyriaceae) in Thailand, pp. 1-69 in Phytotaxa 631 (1) on pages 8-9, DOI: 10.11646/phytotaxa.631.1.1, http://zenodo.org/record/10422862