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Published In: Species Muscorum Frondosorum 47. 1830. (Sp. Musc. Frond.) Name publication detail
 

Project Name Data (Last Modified On 2/18/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/18/2011)
Discussion:

As noted by Andrews (1935) the Bryaceae seem to be “a very natural” group, but it is extremely large, variable, and numbingly complex. As a result it is nearly impossible to characterize. The family has a few genera (e.g., Epipterygium with complanate, dimorphic leaves) with odd gametophytes, but otherwise it typically has nondescript gametophytes with short, erect, acrocarpous stems, lanceolate to ovate, unicostate leaves that are generally acute, have bordered or unbordered margins, and relatively long leaf cells. Peristome development within the family is also remarkably variable, ranging from genera (e.g., Rhodobryum) having perhaps the most perfectly developed diplolepidous peristome in the mosses through every conceivable type of exostome and/or endostome reduction to absent. Andrews (1935) suggested the family might best be understood as a “single large natural genus (Bryum)” and in this regard it is noteworthy that Ochi, based on long, world-wide experience with its variability and species, consistently took a broad generic view of the family.

Genera and species within the Bryaceae are often based on sporophytic characters and as a result taxonomic problems in the family can be overwhelming (Crum & Anderson 1981). Sterile material sometimes cannot be determined even to genus without extensive prior experience with the family. Likewise, identification at the species level at times requires good sporophytic material.


 

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BRYACEAE

Plants erect, rarely erect from subterranean stolons, usually tufted, green, yellowish, reddish, or hyaline; stems simple or forked, central strand usually present, sometimes densely radiculose. Leaves elliptic to ovate or ovate-lanceolate, linear-lanceolate, lanceolate, to oblong-lanceolate, or setaceous, dimorphic and complanate or terete foliate, usually gradually increasing in size upward, often rosulate; apices usually acute, sometimes awned or piliferous; costae single, subpercurrent, percurrent, or excurrent, usually with well-developed guide cells and stereid cells; margins bordered or unbordered, toothed or entire; areolation firm or lax; upper leaf cells rhombic to linear or vermicular, basal cells rhombic, rectangular, or quadrate. Autoicous or dioicous. Setae terminal, elongate. Capsules erect, suberect, inclined, horizontal, or pendent, zygomorphic or actinomorphic, cylindric, sub-cylindric, clavate, pyriform, oval, or spherical, neck commonly differentiated; opercula convex to short-conic, rarely rostrate; annuli usually well-developed and revoluble; stomata phaneroporic, in neck; peristome diplolepidous, usually complete, exostome of 16 usually narrowly triangular teeth, endostome with basal membrane usually well-developed, segments usually broad and perforate, cilia usually well-developed, nodose or appendiculate, at times the exostome reduced or lacking or the endostome reduced or lacking. Spores round or nearly so. Calyptrae smooth, cucullate.

 

 
 
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