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Published In: Botanische Zeitung (Berlin) 3: 865. 1845. (Bot. Zeitung (Berlin)) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 10/18/2013)
Acceptance : Accepted
Note : by Jerry A. Snider
Project data     (Last Modified On 6/7/2011)
Discussion: This genus is nicely defined in terms of Ditrichum-like leaves, dark, shiny, immersed capsules, differentiated opercula, broad annuli, thin-walled exothecial cells, short, irregularly bifid peristome teeth, and rough, conic-mitrate calyptrae. Astomiopsis differs most significantly in having no peristome and smooth, cucullate calyptrae.
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Plants small, gregarious or loosely tufted, dull, yellow-green or brownish. Stems simple, radiculose only at base. Leaves small below, larger and more crowded in a comal tuft above, loosely appressed when dry, erect-spreading when moist, lanceolate, slenderly acuminate; costa subpercurrent to slightly excurrent (in uppermost leaves); upper cells elongate, smooth, thin- or thick-walled; basal cells broader and laxer. Dioicous. Perichaetial leaves similar to the upper leaves. Setae very short, erect; capsules immersed, oblong- to ovoid-cylindric, truncate at base, dark red-brown and shiny; annulus large, consisting of 2 layers of vesiculose cells, revoluble in fragments; operculum conic, apiculate; exothecial cells large, lax and thin-walled, irregularly oblong-hexagonal, very dark, smaller toward the mouth; peristome inserted shortly below the mouth, short, irregularly forked, golden-brown, densely papillose. Spores spherical. Calyptrae covering only the operculum, conic-mitrate, coarsely mammillose throughout or rarely nearly smooth.

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