Tropicos | Name - !Mironia stenotheca (Thér.) R.H. Zander

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!Mironia stenotheca (Thér.) R.H. Zander

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

Discussion:

Mironia stenotheca differs from all other Central American species of the genus in having leaves with obtuse to broadly rounded apices and entire, fully recurved or revolute margins. There are three Central American species (Barbula orizabensis, Pseudocrossidium replicatum, and Bryoerythrophyllum recurvirostrum) similar to M. stenotheca in leaf shape and in having fully recurved or revolute leaf margins. They all differ from M. stenotheca in having unistratose leaf margins. In addition, Barbula orizabensis has short, mostly papillose, basal leaf cells, Pseudocrossidium replicatum has a single (dorsal) stereid band in its costa, and Bryoerythrophyllum recurvirostrum has dentate upper leaf margins.

Illustrations: Thériot (1931, Fig. 12); Zander et al. (1980, Figs. 1–17, as Morinia saitoana); Zander (1993, Pl. 23 1–11); Sharp et al. (1994, Fig. 212). Figure 57.

Habitat: Moist boulder at edge of brook; 2895 m.

Distribution in Central America: GUATEMALA. Quezaltenango: Sharp 2250 (FH, US). COSTA RICA. Cartago: Holz & Sipman CR99-920 (GOET, MO); San José: Holz & Schäfer-Verwimp CR99-1180 (GOET, MO).

World Range: Mexico; Central America.

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Mironia stenotheca (Thér.) Zand., Bull. Buffalo Soc. Nat. Hist. 32: 112. 1993.

Barbula stenotheca Thér., Smithsonian Misc. Collect. 85(4): 21.1931. Morinia stenotheca (Thér.) Zand., Bryologist 86: 156. 1983. Protologue: Mexico. Valle de México; Río Frío, on earth (Bro. Amable 1726).

Morinia saitoana Zand., Delg. & Eckel, Bryologist 83: 510. 1980 [1981].

Protologue: Mexico. Veracruz, Cofre de Perote, ca 19°29'N, 97°10'W, Abies religiosa forest, moist earth, partially shaded, 3400 m elev., 30 Oct. 1979, D. Hernández L. 100.

Plants medium-sized, reddish green or reddish yellow, to 16 mm high. Stems reddish yellow, erect, irregularly branched, sclerodermis and central strand present; rhizoids red, smooth. Leaves 2.0–2.3 mm long, erect-sheathing, erect-twisted and incurved when dry, erect-spreading when wet, oblong to oblong-lanceolate; apices obtuse to rounded, stoutly mucronate; margins bistratose, narrowly recurved or revolute to near the apex, entire, not bordered, decurrent at base; costa short-excurrent, smooth at back, ventral surface cells short-rectangular, pluripapillose, guide cells, weak ventral stereid, and dorsal stereid bands present, upper ventral surface layer somewhat enlarged, papillose; upper cells 8–10 x 6–8 μm, firm-walled, irregularly quadrate to rhombic or hexagonal, densely pluripapillose by thick, c-shaped papillae, basal cells smooth, rectangular, thin-walled, not or weakly bulging, 30–60 x 8–10 μm, alar cells not differentiated. Dioicous. Sporophytes not seen. “Setae 12–13 mm long; capsules 5–6 mm long, long-cylindric; operculum up to 1.2 mm long, with cells in spiral rows; peristome up to 1000 μm long, counterclockwise-twisted above a low membrane 0.5–1 time. Spores (immature) ca. 9 μm, essentially smooth, yellow.” (Zander, 1994a).