Abrodictyum C. Presl
Creators: name: Dubuisson, Jean-Yves
name: Bauret, Lucie
name: Boucheron-Dubuisson, Elodie
name: Rouhan, Germinal
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Polypodiopsida
Hymenophyllales
Hymenophyllaceae
Abrodictyum

description: New key to the Abrodictyum species in the Afro-Malagasy region (modified from Dubuisson et al. 2017)
- Distal ultimate lobes or segment usually multi-veined and/or fused, often spatulate and appearing serrulate...... A. pachyphlebium
1. Distal ultimate lobes or segment usually single-veined, free, or sometimes fused by pair................................................................ 2
2. Lamina apparently absent or reduced to one row of cells on both sides of the veins ........................................................................ 3
- Lamina always developed .................................................................................................................................................................. 4
3. Fronds subsessile or with short stipes not exceeding 4–5 cm, narrowly oblong to linear on herbarium, always with a narrowly cylindrical brush-like shape when fresh ...................................................................................................................... A. cylindratum
- Fronds with stipes usually longer than 4–5 cm, narrowly to widely lanceolate when dried, plane or with a lanceolate brush-like shape when fresh ......................................................................................................................................................... A. parviflorum
4. Lamina of ultimate segments usually not exceeding 3 cells on both sides of the veins..................................................................... 5
- Lamina of ultimate segments with usually more than 3 cells on both sides of the veins................................................................... 6
5. Lamina width often variable (1 to 3 rows of cells on both sides of the veins) within the same frond; fronds narrowly to widely lanceolate, plane or with a brush-like shape; usually more than 6 sori per pinna....................................................... A. parviflorum
- Lamina width usually not variable within the same frond; fronds narrowly oblong to linear, sometimes narrowly lanceolate but never widely lanceolate, always plane; often a single sorus per pinna, rarely more than 6 sori per pinna.......................................... ........................................................................................................................................................................ A. angustimarginatum
6. Rhizomes erect; lamina without a clearly distinct marginal row of cells; plants usually terrestrial or saxicolous, rarely epiphytic... ............................................................................................................................................................................................................ 7
- Rhizomes short-creeping; lamina with a clearly distinct marginal row of cells; plants usually epiphytic, sometimes saxicolous ..... ................................................................................................................................................................................ A. tamarisciforme
7. Fronds bipinnate-pinnatifid or more divided, always plane in the wild, never crispate or curled ..................................................... 8
- Fronds rarely more than bipinnate-pinnatifid, usually with pinnules curled in the wild .................................................. A. franceae
8. Fronds often more divided than bipinnate-pinnatifid, broadly lanceolate to triangular, often exceeding 30 cm long; lamina dark green and opaque; sori cylindrical to slightly campanulate .................................................................................................. A. dregei
- Fronds usually not more divided than bipinnate-pinnatifid, usually not exceeding 13.5 cm long, narrowly lanceolate; lamina light green and translucent; sori obconic (cup-shaped) ....................................................................................... A. inexpectatum sp. nov.
description: Published as part of Dubuisson, Jean-Yves, Bauret, Lucie, Boucheron-Dubuisson, Elodie & Rouhan, Germinal, 2022, Abrodictyum inexpectatum, an unexpected new fern species (Hymenophyllaceae, Polypodiidae) for Madagascar, as revealed by an integrative approach, pp. 83-91 in Phytotaxa 568 (1) on page 90, DOI: 10.11646/phytotaxa.568.1.6, http://zenodo.org/record/7184304