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BFNA Title: Homaliadelphus |
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XX. HOMALIADELPHUS Dixon & P. de la Varde,
Rev. Bryol. Lichenol. 2. 4: 142. 1932. * [Genus Homalia and Greek adelphos, brother, alluding to a similarity with Homalia] Plants small, flat, glossy. Stem creeping, sparsely branched to
irregularly pinnate; flagelliform branches absent. Paraphyllia present. Stem
and branch leaves wide-spreading, smooth, flat, slightly asymmetric, apex
rounded, small lobe at adaxial base of lateral leaves; margins entire or
slightly denticulate; costa absent or short-double. Inner
perichaetial leaves oblong from a sheathing base [ovate at base turning
subulate], obtuse, apex entire to crenulate proximally [smooth], serrulate;
apical cells quadrate to rhombic, basal cells rectangular. Sexual condition dioicous (male
plants epiphytic on female plants). [Seta 4--6 mm. Capsule oblong-cylindric; exostome teeth lanceolate, smooth to
slightly striate at base; endostome with low basal membrane. Spores 15--20 \um] Species 2 (1
in the flora): North America, The characteristic
adaxial basal leaf lobe of Homaliadelphus easily
separates this genus from other members of the Neckeraceae.
In North America this genus is restricted to calcareous rocks, although in 1. Homaliadelphus
sharpii
(R. S. Williams) Sharp, Castanea 9: 107. 1944 Homalia
sharpii
R. S. Williams, Bryologist 34: 20, plate 2. 1931 Plants less than 3 cm. Stem and branch leaves obovate to nearly rounded, 0.5--1.5(--2) mm; apical cells rounded-quadrate
to short-oblong, 6--9 x 6 \um, distal medial cells irregularly rhombic, 10 x 10
\um, basal cells 20--27 x 9 \um, basal marginal cells short-rhomboidal to
fusiform-elongate, slightly pitted, ca. 9 x 8 \um. Shaded
calcareous rocks, cliffs or soil, hardwood-pine forests; 200--500 m; |
