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!!Amphidium Schimp. Search in The Plant ListSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Corollarium Bryologiae Europaeae 39–40. 1856. (Coroll. Bryol. Eur.) Name publication detail
 

Project Name Data (Last Modified On 2/15/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/15/2011)
Discussion: The systematic position of Amphidium has been controversial with the genus often treated either in the Orthotrichaceae near Zygodon or the Dicranaceae/Rhabdoweisiaceae near Rhabdoweisia. Determining whether Amphidium belongs to the Haplolepideae or Diplolepideae is difficult because the genus is eperistomate and its gametophyte shows weak morphological evidence supporting either position. Lewinsky (1976) placed Amphidium in the Orthotrichaceae because of its papillose calyptrae and similarities between the young capsules of Amphidium and Orthotrichum. The capsule evidence linking the genera rests on the presence of 16 trabecular filaments in the region of the spore sac. Haplolepideous mosses studied, in contrast, either lack trabecular filaments or have 16 bulging cells projecting into the air space (Kreulen 1972). Recent molecular evidence (Goffinet et al. 1998, Stech 1999, La Farge et al. 2000) indicates the genus belongs in the Haplolepideae. Within the Haplolepideae, Goffinet et al. (1998) suggested Amphidium may be close to Glyphomitrium (Ptychomitriaceae, Grimmiales), while Stech (1999) and Buck & Goffinet (2000) place the genus in the Rhabdoweisiaceae (Dicranales). Although LaFarge et al. (2000) considered their data were “insufficient” to indicate a family placement for Amphidium, they placed the genus, along with the Rhabdoweisiaceae, in the Pottiales. In a recent revision Frahm et al. (2000) reduced Amphidium from 13 species to three and placed the genus in the Dicranaceae.

 

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Amphidium Schimp., Coroll. 39. 1856, nom. cons.


Plants small to medium-sized, caespitose, olive‑green above, yellow‑brown below. Stems erect, repeatedly forked, sparingly radiculose. Leaves erect at base, crisped and contorted when dry, flexuose spreading when wet, keeled, linear to linear‑lanceolate, acute; costa subpercurrent; margins irregularly recurved; cells short, rounded above, rectangular below, pluripapillose or papillose‑striate. Setae short, erect or curved. Capsules ovoid to ovoid‑oblong, deeply 8 plicate; opercula apiculate to shortly rostrate; peristome absent. Spores spherical. Calyptrae cucullate, smooth.

 
 
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