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Published In: Revue Bryologique 36: 109. 1909. (Rev. Bryol.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

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Acceptance : Accepted
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Discussion:

Macromitrium fragilicuspis has entire to weakly crenulate leaves that are abruptly rounded to long, fragile subulae. Its basal leaf margins have enlarged, pointed teeth, a feature that aligns the species with those of Group 3. Macromitrium frustratum and M. sejunctum are similar to M. fragilicuspis in having fragile leaf tips. The leaves of M. frustratum are considerably larger (5–7 mm long) than those of M. fragilicuspis, they have serrate margins, and gradually long‑acuminate apices. The leaves of M. perfragile differ from those of M. fragilicuspis in having sharply dentate margins and short, non‑tuberculate basal cells. Neither M. frustratum nor M. sejunctum have swollen teeth on the basal leaf margins.

At a superficial glance M. fragilicuspis is difficult to distinguish from Groutiella tomentosa or Schlotheimia angustata. All three species have similarly shaped leaves with long fragile subulae. Groutiella tomentosa is separated from M. fragilicuspis by its limbate leaves. Schlotheimia angustata is a reddish‑green, densely tomentose species that differs from M. fragilicuspis in having somewhat rugose leaves with non‑tuberculate basal cells.
Illustrations: Bartram (1949, Fig. 101 I); Sharp et al. (1994, Fig. 475). Fig. 233.
Habitat: On bark of tree trunks and branches; 1050–2300 m.
Distribution in Central America: GUATEMALA. Alta Verapaz: Hermann 26358 (F); Baja Verapaz: Sharp 2858 (FH, TENN, US); Guatemala: Standley 80664 (F, FH); Huehuetenango: Standley 82368 (NY); Jalapa: Steyermark 32532 (F, FH). HONDURAS. Comayagua: Standley & Chacón 6884 (F); Francisco Morazán: Standley & Molina 4174 (F, FH); Lempira: Allen 11883 (MO, TEFH). NICARAGUA. Jinotega: Standley 10200 (F, FH); Matagalpa: Davidse et al. 30384 (MO).
World Range: Mexico; Central America.

 

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Macromitrium fragilicuspis Card., Rev. Bryol. 36: 109. 1909.

Protologue: Mexico. Etat de Vera Cruz: prés de Jalapa, 1908 n. Pringle 15168 (NY). 

Plants small to medium-sized, greenish brown to greenish yellow. Stems weakly creeping, branches to 2.5 cm long, moderately tomentose below. Leaves strongly keeled, erect below, spirally twisted around stems to flexuose‑incurved above when dry, erect‑spreading when wet, 1.7–2.3 mm long (to 3.0 mm long with intact leaf tips), 0.5 mm wide, lanceolate; apices abruptly rounded to long (1 mm), fragile, multistratose subulae; margins entire to obscurely crenulate by bulging cell walls, recurved below, plane to weakly recurved above, enlarged basal teeth at leaf insertion present; costae percurrent; upper interior cells 4–6 μm, quadrate, at times weakly rounded, smooth to weakly bulging, upper marginal cells not differentiated, basal cells 16–26 μm long, rectangular, incrassate and porose, tuberculate. Setae 5–6 mm long, smooth. Capsules to 2 mm long, cylindric‑ovoid, furrowed; annulus and mature operculum not seen; exostome teeth 16, short, truncate and united forming a papillose, reddish orange membrane, endostome hyaline, weakly papillose. Spores anisosporous, 17–20 μm and 32–40 μm. Calyptrae mitrate, strongly laciniate, naked, 3 mm long.

 

 
 
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