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Published In: Revue Bryologique et Lichénologique 5: 95. 2. 1933. (Rev. Bryol. Lichénol.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 2/16/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/16/2011)

Weisiopsis oblonga can be confused with Hyophila involuta, Plaubelia sprengelii or Luisierella barbula 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 usually a larger plant than Weisiopsis oblonga, it has two well-developed costal stereid bands, a dioicous sexual condition, eperistomate capsules, and often has dentate upper leaf margins. Plaubelia sprengelii is similar in size to Weisiopsis oblonga but it differs from that species in its dioicous sexual condition and in having shorter peristome teeth, at times two stereid bands in its costa, and the presence of greatly enlarged and bulging epidermal cells on the vental costal surface. Luisierella barbula differs from Weisiopsis oblonga in having thin-walled cells extending up the basal margins in a v-shaped pattern.

Illustrations: Thériot (1932, Fig. 2); Bartram (1949, Fig. 52 A–C); Zander (1993, Pl. 67 6–11); Sharp et al. (1994, Fig. 285). Figure 91.
Habitat: On bare soil bank along trail; 400–1100 m.
Distribution in Central America: GUATEMALA. Huehuetenango: Sharp 4981 (TENN); HONDURAS. Comayagua: Olson 84–44a (MO); Olancho: Allen 12479 (MO, TEFH).
World Range: Mexico; Central America.


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Weisiopsis oblonga Thér., Rev. Bryol. Lichénol. 5: 95. 1932 [1933].

Protologue: Mexico. Nepantla, sur la terre (St.-P. [Marius Saint-Pierre] n° 1830). 

Plants small, light-green, 1–2 mm high. Stems evenly foliate, not branched, sclerodermis and central strand present; rhizoids sparse, red or hyaline, smooth. Leaves 1.0–1.5 mm long, erect at base, tubulose, incurved when dry, spreading when wet, long-lingulate to spathulate, concave; apices rounded to obtuse, narrowly but deeply grooved along the costa; margins unistratose, plane or incurved, entire to minutely crenulate by projecting cell walls, not bordered; costa subpercurrent, guide cells and single (dorsal) stereid band present, surface cells elongate, ventral surface layer of enlarged, hyaline cells; upper cells rounded-hexagonal to quadrate, 5–9 x 4–10 μm, mammillose-bulging on upper surface, plane to weakly convex, smooth on dorsal surface, basal cells abruptly enlarged, hyaline, 30–50 x 14–20 μm, rectangular, with thin, bulging walls. Autoicous. Perichaetial terminal. Setae 3–6 mm long, yellow. Capsules 0.6–1.2 mm long, ellipsoid to cylindric, smooth, yellow-brown, red at capsule mouth; stomata in neck; opercula 0.3–0.4 mm long, conic-rostrate; annuli of 2–3 rows of vesiculose cells; peristome of 16 red, spiculose, well-spaced, long-linear teeth, inserted within the mouth, to 450 μm long, erect, to slightly twisted, basal membrane absent. Spores 8–10 μm, smooth to lightly roughened. Calyptrae 1.0–1.5 mm long.



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