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FNA | Family List | FNA Vol. 28 | Brachytheciaceae | Brachytheciastrum

3. Brachytheciastrum delicatulum (Flowers) Ignatov, Arctoa. 19: 30. 2011.

Brachythecium delicatulum Flowers, Bryologist 76: 287. 1973

Plants moderately small to medium-sized, in loose or moderately dense tufts, green to yellowish. Stems to 5 cm, creeping, terete-foliate, not julaceous, irregularly to regularly pinnate, branches to 10(-15) mm, terete- or subcomplanate-foliate. Stem leaves erect at base, densely to loosely arranged, often loosely arranged at shoot ends, falcate-secund, ovate or ovate-lanceolate, slightly to moderately plicate, rarely not plicate, 1.4-2.5 × 0.3-0.5(-0.7) mm; margins plane or recurved in places (more commonly proximally), serrulate to base, rarely subentire; apex gradually or abruptly long-acuminate, acumen often falcate or flexuose; costa to 50-75% leaf length, terminal abaxial spine small; alar cells subquadrate, 10-25 × 8-15 µm, region extensive, triangular, of 8-10 × 5-8 cells, fairly distinctly delimited; laminal cells linear, 50-90 × 45-10µm; basal juxtacostal cells shorter, to 8-10 µm wide, indistinctly delimited. Seta reddish, 1-1.5 cm, smooth or slightly rough distally. Capsule inclined, sometimes slightly erect, reddish, ovate, 1-2 mm; endostome basal membrane 1/5 -1/3 endostome length, cilia short to absent. Spores 10-15 µm.

Soil, damp to dry rock, shaded places, under overhanging rock and exposed tree roots; moderate to high elevations (1500-1900 m); Utah.

Brachytheciastrum delicatulum is characterized by narrow leaves, many of them more than five times longer than wide, rather numerous alar cells, and, usually, an almost erect capsule with a reduced peristome. The branch leaves are lanceolate to linear. The species is known only from Millard County.


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