Tropicos | Name - !Luisierella barbula (Schwägr.) Steere

Cent. Amer. Moss > Pottiaceae > Luisierella > Luisierella barbula

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!Luisierella barbula (Schwägr.) Steere

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Project Name Data (Last Modified On 2/16/2011)

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Project data (Last Modified On 2/16/2011)

Discussion:

Luisierella barbula is known in Central America only from Belize where it is restricted to limestone rocks. It can be confused with Hyophila involuta, Plaubelia sprengelii or Weisiopsis oblonga since all four species have rounded to obtuse, spathulate leaves that are tubulose when dry and leaf cells that are mammillose-bulging on the ventral surface but mostly plane and smooth on the dorsal surface. Hyophila involuta is a larger plant than Luisierella barbula, it has two well-developed costal stereid bands, a dioicous sexual condition, and mostly firm-walled basal leaf cells. Plaubelia sprengelii is closer in size to Luisierella barbula, but it differs from that species in its dioicous sexual condition, in having a stem central strand, often two stereid bands in its costa, and firm-walled basal leaf cells. Weisiopsis oblonga differs from Luisierella barbula in having the inflated, thin-walled cells in the leaf base extending higher near the costa than at the basal margins.

Illustrations: Schwaegrichen (1826, Pl. 175); Potier de la Varde (1936, Fig. 1); Grout (1940, Pl. 114 12–20); Crum and Steere (1957, Fig. 27); Crum and Anderson (1961, Figs. 1–6); Crum and Anderson (1981, Fig. 166); Zander (1993, Pl. 68); Sharp et al. (1994, Fig. 286). Figure 53.

Habitat: On limestone; 500 m.

Distribution in Central America: BELIZE. Belize: Townsend 94/131 (Herb-Townsend); Cayo: Mains 3732 (MICH).

World Range: South-Central and Southeastern U.S.A.; Mexico; Central America; Caribbean, Brazil; Eastern Asia; Malesia.

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Luisierella barbula (Schwaegr.) Steere, Bryologist 48: 84. 1945.

Gymnostomum barbula Schwaegr., Sp. Musc. Frond. Suppl. 2. 2: 77. 1826. Hyophila barbula (Schwaegr.) Hampe, Bot. Zietung (Berlin) 4: 267. 1846. Pottia barbula (Schwaegr.) C. Müll., Syn. Musc. Frond. 1: 558. 1849. Weisia barbula (Schwaegr.) Mitt., J. Linn. Soc., Bot. 12: 136. 1869. Hymenostylium barbula (Schwaegr.) Mitt., Rep. Challenger, Bot. 1(2): 91. 1885. Gyroweisia barbula (Schwaegr.) Par., Index Bryol. (ed. 2), 299. 1904. Tuerckheimia barbula (Schwaegr.) Hilpert, Beih. Bot. Centralbl. 50(2): 656. 1933. Desmatodon barbula (Schwaegr.) Grout, Moss Fl. N. Amer. 2(5): 271. 1940.

Protologue: Cuba. Ad rupes calcareas Cubenses legit clar. D. Poeppig.

Plants small, dark-green to blackish, 1–2 mm high. Stems erect, not branched, evenly foliate, sclerodermis present, central strand absent, rhizoids sparse, at base of stems, red, smooth. Leaves 1.0–1.5 mm long, erect at base, tubulose, incurved contorted when dry, spreading when wet, lingulate-lanceolate, concave; apices rounded to obtuse; margins unistratose, plane or erect-incurved, minutely crenulate by bulging cell walls, not bordered; costa subpercurrent, ending 4–5 cells below apex, ventral superficial cells quadrate-bulging above, elongate below, in cross-section with guide cells, single (dorsal) stereid band, and epidermal layer of enlarged, rounded, hyaline cells; upper cells 8–14 μm, mammillose-bulging on upper surface, plane to weakly convex, smooth on dorsal surface, rounded-hexagonal, basal cells abruptly enlarged, hyaline, 30–50 x 14–10 μm, rectangular, with thin, bulging walls continued upwards along the margins in a v-shaped pattern. Heteroicous, plants synoicous, or with a mixture of synoicous and archegoniate perichaetia or dioicous; perichaetia terminal. Setae 1–2 per perichaetium, 4–5 mm long, red. Capsules 1–2 mm long, narrowly cylindric, erect to slightly curved, smooth, red; stomata in neck; opercula 1 mm, conic-rostrate; annuli of 2–3 rows of vesiculose cells; peristome variable: absent, rudimentary, or of 16 red, spiculose, erect, linear teeth, to 500 μm long, basal membrane absent. Spores 8 μm, smooth. Calyptrae 2 mm long.