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Ptychomitrium Fürnr. 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: Flora 12((2) Erganzungsblatter): 19. 1829. (Flora) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 2/17/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/17/2011)
Discussion:

Ptychomitrium has often been associated with the Orthotrichaceae, but its peristome is haplolepidous (Edwards 1979, Crum 1994a) and structurally very close to that of Racomitrium. It has a large, mitrate calyptra that varies from 1/2 to completely covering the capsule and may be plicate or deeply lobed. Calyptrae identical to those of Ptychomitrium also occur in Racomitrium. A distinctive feature of the genus is found in the species with fully bistratose leaves. In those species the leaf cells, especially in the ventral layer, are bulging-mammillose in a manner similar to those of Timmiella anomala. Although Ptychomitrium overlaps with the Grimmiaceae in nearly every feature, the genus is sometimes placed in its own family.


 

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Ptychomitrium Fürnr., Flora 12 (Erg. 2): 19. 1829. 

Plants small to large in dark-green, blackish or brownish green tufts or cushions. Stems erect, simple or forked. Leaves crisped, inrolled or appressed when dry, erect‑spreading to spreading when wet, oblong to lingulate‑lanceolate or lanceolate; apex cucullate, broadly acute to acuminate; margins erect, recurved or incurved, uni‑ or bi‑stratose, entire or serrate; costa single, strong, subpercurrent to percurrent; lamina uni‑ or bistratose; upper cells rounded‑quadrate, firm‑walled, basal lower cells elongate to oblong or quadrate to short‑rectangular, smooth. Autoicous. Perichaetial leaves not differentiated. Setae single or multiple. Capsules exserted, oblong to cylindrical; opercula long-rostrate; peristome of 16 teeth split nearly to the base into 2–3 papillose divisions. Calyptrae mitrate, deeply lobed, plicate.

 

 
 
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