Rhabdoweisia

Bruch & Schimper

Bryol. Europ.1: 97. 1846 ,

Etymology: Greek rhabdos, rod, presumably alluding to ribbed capsule, and genus Weissia, alluding to resemblance
Found in FNA Volume 27. Treatment on page 428. Mentioned on page 359, 383.
Plants in short loose tufts, perennial, dull green to brownish. Stems 0.2–3 cm, erect, forked by innovations, red-brown, without central strand, rhizoids smooth, at base of stem. Leaves oblong-lanceolate to narrowly lanceolate, obtuse to acute, keeled, strongly divergent when moist, crisped to sinuose when dry, 2–4 mm; costa subpercurrent, formed of rectangular cells; margins usually recurved, mainly serrate to serrulate along distal margins, with 1-celled irregular teeth; laminal cells smooth, proximal cells hyaline to brownish, rectangular, thin-walled, absent chlorophyll; distal cells, quadrate to irregular, usually broader than long, chlorophyllose except for the marginal teeth. Specialized asexual reproduction absent. Sexual condition autoicous; perigonial leaves short-elliptic; perichaetial leaves not differing from the vegetative. Seta solitary, erect, yellow, 2–6 mm, smooth. Capsule exserted, erect, brown to yellow-brown, 0.5–1 mm, symmetric, ovoid to oblong-cylindric, when dry and empty contracted below mouth and deeply 8-furrowed,; annulus absent; stomata at base of urn, phaneropore; operculum obliquely subulate, 0.5–1 mm; peristome single, 16 teeth joined by a low basal membrane, inserted slightly below mouth, irregular and not forked, early deciduous. Calyptra cucullate, smooth, covering 1/2 of capsule. Spores nearly spherical to slightly angled, smooth, 16–20 µm, papillose.

Distribution

North America, South America, Europe, Asia, Africa, Pacific Islands.

Discussion

Species 6 (2 in the flora).

Rhabdoweisia is known predominately from the Northern Hemisphere. A strong case has been made to include this, as well as other genera, in the family Rhabdoweisiaceae Limpricht.

Key

1 Leaves long-ligulate, 2-4 mm, broadly acute to obtuse, irregularly dentate in distal part, distal cells hexagonal, 14-20 µm wide, thin-walled relative to the lumina. Rhabdoweisia crenulata
1 Leaves linear-lanceolate, 2-3.5 mm, gradually and narrowly acute, serrulate in distal part, distal cells mainly quadrate, often wider than long, 10-14 µm wide, somewhat incrassate. Rhabdoweisia crispata
Facts about "Rhabdoweisia"
AuthorWilfred B. Schofield +
EtymologyGreek rhabdos, rod, presumably alluding to ribbed capsule, and genus Weissia, alluding to resemblance +
IllustratorPatricia M. Eckel +
Referencelawton1961a +
Taxon nameRhabdoweisia +
Taxon parentDicranaceae +
Taxon rankgenus +
VolumeVolume 27 +