Pyxine cognata Stirt., Proc. Royal Phil. Soc. Glasgow
Creators: name: Mongkolsuk, Pachara
name: Meesim, Sanya
name: Poengsungnoen, Vasun
name: Kalb, Klaus
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Fungi
Ascomycota
Lecanoromycetes
Teloschistales
Physciaceae
Pyxine
Pyxine cognata

description: <b>6.</b> <b> <i>Pyxine cognata</i> Stirt.</b> , <i>Proc. Royal Phil. Soc. Glasgow</i> 11: 311 (1879). Holotype:— INDIA. Nilgherries [Nilgiri]; <i>A. Watt</i> s. n. (BM!).— <i>Pyxine berteriana</i> var. <i>himalaica D. D. Awasthi</i>, <i>Phytomorphology</i> 30: 366 (1982). Holotype:— INDIA. Almora district; Uttar Pradesh, on way to Kasardevi, ca. 1930 m, on bark, 12 June 1956, <i>D. D. Awasthi</i> 3476 (LWG!). Thallus corticolous, 2–6 cm wide, adnate to tightly adnate. Lobes radiating, discrete to ± contiguous, plane to slightly concave, in older thalli becoming slightly convex in the centre, 0.3–1.0 mm wide, subrotund to truncate at the apices. Upper surface white to whitish grey or grey-brown, pruinose in extended patches near the apices, the pruina ± glistening; polysidiangia, isidia and soralia absent. Pseudocyphellae not prominent, usually retricted to the margins, rarely laminal or becoming subreticulate, often obscured by spreading pruina. Medulla orange in upper part; lower medulla white. Lower surface black in the centre, paler towards the margin; rhizines ± dense, furcate. Apothecia common, <i>obscurascens</i> - type, 0.3–1.0 mm wide; disc epruinose. Internal stipe distinct, upper part orange-red, K + pale red, P-, C-, KC-, lower part much paler or white, K-, P-, C-, KC-. Ascospores (13–) 16–20 × 6–7 μm. Pycnidia not seen. Chemistry: Cortex K-, UV + yellow; medulla K-, C-, KC-, P-; containing lichexanthone (major), terpenes (major or minor), unknown pigment (minor or trace). <b>Distribution and habitat</b>:—Uncommon on bark in dry dipterocarp, dry evergreen and mixed deciduous forests. Also in Australia, China, India, Java and South America; not yet known from Africa. <b>Notes</b>:— <i>Pyxine cognata</i> is characterized by the cortical lichexanthone, the absence of vegetative propagules, the partly orange medulla and apothecia of the <i>obscuracens</i> - type with an orange-red, K+ pale red internal stipe. <i>Pyxine berteriana</i> is similar, but it has broader, sparsely pruinose lobes and a medulla that is partly yellow. The two species contain very different arrays of terpenes (Kalb, 1987, pl. 11). <b>Material from</b> <b>Thailand examined</b>:— Chiang Mai; Queen Sirikit Botanic Garden, on <i>Melia azedarach</i>, hill evergreen forest, 1170 m, 30 June 1994, <i>K</i> <i>.</i> <i>Boonpragob 2278</i> (RAMK).— Chiang Mai; Queen Sirikit Botanic Garden, on <i>Stereospermum neuranthum</i>, dry dipterocarp forest, 730 m, 18°53'54'' N, 98°51'38'' E, 30 June 1994, <i>K</i> <i>.</i> <i>Boonpragob 3582</i> (RAMK).— Loei; Phu Luang Wildlife Sanctuary, Pak Dang Forest Ranger Station, on the bark of an unidentified tree in dry evergreen forest, 750 m, 17°10'42'' N, 101°21'48'' E, 22 May 2009, <i>S</i> <i>.</i> <i>Meesim 259</i> (RAMK).— Loei; Phu Luang Wildlife Sanctuary, Phu Ho Forest Ranger Station, on the bark of <i>Tamarindus indica</i> in mixed deciduous forest, 569 m, 17°07'13'' N, 101°34'30'' E, 29 July 2009, <i>S</i> <i>.</i> <i>Meesim 338</i> (RAMK).— Loei; Phu Luang Wildlife Sanctuary, Nam Chan Forest Ranger Station, on the bark of an unidentified tree in mixed deciduous forest, 397 m, 17°20'49'' N, 101°33'29'' E, 28 July 2009, <i>S</i> <i>.</i> <i>Meesim 344</i> (RAMK).— Loei; Phu Luang Wildlife Sanctuary, Nam Chan Forest Ranger Station, on the bark of <i>Saraca indica</i> in mixed deciduous forest, 397 m, 17°20'49'' N, 101°33'29'' E, 28 July 2009, <i>S</i> <i>.</i> <i>Meesim 347, 348</i> (RAMK).— Nakhon Ratchasima; Khao Yai National Park, on the bark of <i>Roystonea regia</i> in secondary forest, 385 m, 14°33' N, 101°40' E, 15 January 2000, <i>N</i> <i>.</i> <i>Homchantara 16269</i> (RAMK).
description: Published as part of <i>Mongkolsuk, Pachara, Meesim, Sanya, Poengsungnoen, Vasun &amp; Kalb, Klaus, 2012, The lichen family Physciaceae in Thailand-I. The genus Pyxine, pp. 32-54 in Phytotaxa 59 (1)</i> on page 42, DOI: 10.11646/phytotaxa.59.1.2, http://zenodo.org/record/5061495
description: {"references": ["Kalb, K. (1987) Brasilianische Flechten. 1. Die Gattung Pyxine. Bibliotheca Lichenologica 24: 1 - 89."]}