Diplaziopsidaceae X. C. Zhang & Christenh
| Main Authors: | Christenhusz, Maarten J. M., Zhang, Xian-Chun, Schneider, Harald |
|---|---|
| Format: | info publication-taxonomictreatment Journal |
| Terbitan: |
, 2011
|
| Subjects: | |
| Online Access: |
https://zenodo.org/record/4911821 |
Daftar Isi:
- Family 34. Diplaziopsidaceae X.C.Zhang & Christenh., fam. nov. 3 genera (Diplaziopsis (type of the family), Hemidictyum, Homalosorus). Filices mediocres vel grandes; rhizomatibus crassis, erectis vel decumbentibus; laminis 1-pinnatis, imparipinnatis, pinnis integris, glabris; venis lateralibus utroque costulae latere discretis sed margines versus reticulatim anastomosantibus, areolarum 2–4 series facientibus, sine venulis discretis inclusis; soris secus venas longas prope costulam elongatis, indusio similiter elongato membranaceo obtectis; indusiis plerumque 3–8 mm, interdum ad 1–2 cm longis, arcuatis, allantoideis; numero basico chromosomatum x=31, 40, 41. Genus quod est typus familiae: Diplaziopsis C.Chr. Description: Medium or large ferns, usually in forests near or by streams. Rhizomes decumbent to erect, thick; lamina 1-pinnate, imparipinnate, with pinnae entire, glabrous; veins free on either side of the midrib, but fully anastomosing toward the margins where they form 2 – 4 rows of areoles, without included free veinlets; sori elongate along the long veins close to the midrib, covered by a similarly elongates, membranous indusium; indusia usually 3 – 8 mm, sometimes up to 1 – 2 cm long, arched, sausage-like; spores with wing-like fimbriate and echinate folds, or low perforate plain folds. X=41, 40 or 31. Notes:— Homalosorus pycnocarpos (Spreng.) Pic.Serm. has been transferred to Diplaziopsis by Price (1990). Different from the Asian Diplaziopsis with x=41, the temperate North American Homalosorus pycnocarpos has x=40 and the tropical American genus Hemidictyum marginatum with x=31. Hemidictyum was first shown to be sister to the Aspleniaceae by Schuetpelz & Pryer (2007), but no Diplaziopsis was included in their study. Here, we incorporate new evidence generated in the laboratory of X.-C. Zhang, and place these genera in one family (Wei et al. 2010). The inclusion of Hemidictyum in Diplaziopsidaceae is however still tentative; further studies will have to confirm its placement.
- Published as part of Christenhusz, Maarten J. M., Zhang, Xian-Chun & Schneider, Harald, 2011, A linear sequence of extant families and genera of lycophytes and ferns, pp. 7-54 in Phytotaxa 19 on page 15, DOI: 10.11646/phytotaxa.19.1.2, http://zenodo.org/record/4893995