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Published In: Linnaea 38: 638. 1876. (Linnaea) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 2/15/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/15/2011)
Discussion: Barbula orizabensis is medium-sized species with leaves that are erect-incurved and spirally twisted around the stem when dry. The leaves of B. orizabensis are ovate at base, abruptly rounded to emarginate at the apex, and have margins revolute to near the apex. Its leaf cells are small, densely papillose, and the upper and lower leaf cells are only weakly differentiated. The combination of densely papillose leaf cells and strongly revolute leaf margins distinguish B. orizabensis from all other Central American species of Barbula. Zander (1994a) considered this species similar to B. unguiculata Hedw. That species is more northern in distribution and differs from B. orizabensis most clearly in having leaf margins revolute only in the lower ½ to 2/3 of the leaf. It also lacks leaf propagula. Pseudocrossidium replicatum is similar to B. orizabensis in leaf shape, in having revolute margins to near the apex, and in having entirely hyaline axillary hairs. It differs from B. orizabensis in having a single (dorsal) costal stereid band and more tightly involute leaf margins with the interior marginal cells greatly enlarged and thin-walled.
Illustrations: Bartram (1949, Fig. 59 H–K); Zander (1981a, Pl. 1 1–7); Sharp et al. (1994 Fig. 213). Figure 11.
Habitat: On soil, seepy cliff faces, or rocks, near springs, on shady banks or limestone boulders; 1000–2250 m.
Distribution in Central America: GUATEMALA. Alta Verapaz: Sharp 2942 (US); Chiquimula: Steyermark 30662 (F, FH); Guatemala: Standley 62865 (F, FH); Huehuetenango: Williams et al. 41334 (MO); Totonicapán: Williams et al. 41507B (MO). HONDURAS. Francisco Morazán: Allen 17791 (MO, TEFH).
World Range: Mexico; Central America; Caribbean.

 

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Barbula orizabensis C. Müll., Linnaea 38: 638. 1874

Protologue: Mexico. Mexico, ad muros humidos umbrosos urbis Orizaba: C. Mohr aug. 1857; in iisdem locis prius Liebmann et Freder. Müller.

Plants small to medium-sized, dull, yellow-green above, brown below, in tufts, 10–30 mm high. Stems red, erect, irregularly branched, sclerodermis and central strand present; rhizoids sparsely distributed at base of stems, smooth to roughened. Axillary hairs 6–7 cells long, all cells hyaline. Leaves 1.5–2.0 mm long, ligulate, ovate-lanceolate, or triangular-lanceolate, crowded to widely spaced on stems, erect-incurved and spirally twisted around the stem when dry, erect-spreading to spreading when wet, deeply grooved ventrally along the costa; apices obtuse to broadly acute, often emarginate, stoutly mucronate; lamina unistratose; margins entire, at times slightly denticulate at extreme apex, revolute to near the apex; costa short-excurrent, papillose at back on upper ventral and dorsal surfaces, surface ventral cells of costa quadrate to short-rectangular, guide cells and two stereid stereid bands well-developed, ventral and dorsal surface layers enlarged; upper cells quadrate or oblate, 4–8 μm, firm-walled, densely pluripapillose, basal cells rectangular to long-rectangular, firm-walled, pluripapillose, 14–28 x 6 μm, extreme basal cells enlarged, 16–40 x 8 μm, firm-walled, at times weakly porose, alar cells not differentiated. Dense clusters of obovate, clavate or globose, stalked, multicellular propagula often in leaf axils. Dioicous. Perichaetia and perigonia terminal; perichaetial leaves neither sheathing nor strongly differentiated. Setae 1 per perichaetia, smooth, 15–20 mm long, red. Capsules long-cylindrical, erect, 2–4 mm long, smooth; exothecial cells short- to long-rectangular, firm-walled; stomata in neck; opercula erect, long-rostrate, 0.7–1.0 mm long; annuli well-developed; peristome red-orange, basal membrane high, teeth spirally twisted, to 1.0 mm long, densely spiculose. Spores 6–10 μm, smooth or lightly papillose. Calyptrae not seen.

 

 
 
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