Mittenothamnium

• Authority

  Buck, William R. 2003. Guide to the plants of central french Guiana. Part 3. Mosses. Mem. New York Bot. Gard. 76: 1-167.

• Family

  Hypnaceae

• Scientific Name

  Mittenothamnium

• Description

  
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  Genus Description - Plants small to medium-sized, in often lustrous, soft to ± stiff, dark green to golden, often extensive, loose mats; stems stipitate, mostly arched, usually wiry, radiculose at tips, freely and irregularly branched, the primary branches often irregularly branched, mostly slender, tapering, laxly to densely foliate, sometimes subcomplanate-foliate, in cross-section with a sclerodermis. Stipe leaves often differentiated, mostly wide-spreading to squarrose, broadly inserted, broadly ovate, gradually or ± abruptly acuminate, stem and branch leaves similar but stem leaves larger, erect- to wide-spreading, stiff, linear-lanceolate to ovate, usually gradually short-acuminate, flat or concave, sometimes subplicate, not or scarcely decurrent; margins serrate to serrulate, often throughout, plane to erect or recurved; costa short and double, sometimes to 1/3 the leaf length, often with one fork longer than the other; cells linear, prorulose at upper ends at back of usually just some cells but rarely all, rarely smooth, often firm-walled, not becoming differentiated toward the insertion; alar cells few in extreme angles, quadrate to subquadrate. Asexual propagula none. Mostly autoicous, sometimes dioicous. Setae elongate, smooth, reddish, twisted; capsules horizontal to pendent, arcuate, asymmetric, cylindric, usually with a differentiated neck, often constricted below the mouth when dry; peristome double, exostome teeth on the front surface cross-striolate below, papillose above; endostome with a high basal membrane, segments keeled, perforate, about as long as the teeth, cilia in groups of 1-3. Calyptrae cucullate, naked or with a few scattered hairs, smooth. Mittenothamnium is restricted here to stipitate plants with arched stems and often slender, tapering branches. The young leaves at the apices of branches are often more strongly serrate than mature leaves. Some cells on each leaf are conspicuously prorulose at the upper ends.