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Published In: Species Muscorum Frondosorum, Supplementum Secundum (2,1): 70–71, pl. 173 [bottom]. 1826. (Sp. Musc. Frond., Suppl. 2) Name publication detail
 

Project Name Data (Last Modified On 3/9/2011)
Acceptance : Accepted
Project data     (Last Modified On 3/9/2011)
Discussion:

Macromitrium richardii is a slender moss with leaves that are crisped and inrolled when dry. It has short, non‑tuberculate basal leaf cells, pluripapillose upper leaf cells, and capsules that are distinctly puckered at the mouth. Macromitrium richardii seems closely related to M. microstomum; both species are autoicous and have puckered capsules. Macromitrium microstomum differs from M. richardii in having leaves with smooth upper cells and exceptionally well-developed basal cells that occupy to _ of the leaf base. Macromitrium podocarpi and M. sharpii are the same size as M. richardii, and all three species have a similar aspect due to the their incurved to inrolled leaf tips. These species differ from M. richardii in having tuberculate basal leaf cells and mammillose upper leaf cells.
Illustrations: Schwaegrichen (1826, Pl. 173); Schwaegrichen (1827, Pl. 190); Grout (1935, Pl. 62B); Crum and Anderson (1981, Fig. 350); Sharp et al. (1994, Fig. 469); Churchill and Linares (1995, Fig. 136 g–l); Magill and Rooy (1998, Fig. 143 14–25). Fig. 248.
Habitat: On bark of tree trunks and branches; 1250–1800 m.
Distribution in Central America: GUATEMALA. Alta Verapaz: Standley 69103 (F). HONDURAS. Olancho: Allen 12873 (MO, TEFH). COSTA RICA. Cartago: Gomez 19391B (MO). PANAMA. Chiriquí: Cornman 3110 (F).
World Range: South‑Central and Southeastern U.S.A.; Mexico; Central America; Caribbean, Western, Northern, and Southern South America, Brazil; South Africa.

 

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Macromitrium richardii Schwaegr., Sp. Musc. Frond., Suppl. 2(2)1: 70. 1826.

Protologue: French Guiana (?). In arboribus Guianae lectum ded. beatus Claud. Richardus. Florschütz (1964, p. 234) considered the origin of the type material uncertain.

Macromitrium didymodon Schwaegr., Sp. Musc. Frond. Suppl. 2(2)2: 138. 1827. Protologue: Brazil. Legit ad vicum Novo Friburgo Brasiliae capsulis maturis mense Decembri dilig. Beyrich.

Macromitrium rhabdocarpum Mitt., J. Linn. Soc., Bot. 12: 199. 1869. Protologue: Ecuador. Andes Quitenses, Antombos, Spruce.

            Plants small-sized, yellowish green above, brown below. Stems strongly creeping, branches 5–8 mm long, weakly tomentose. Leaves moderately keeled, erect below, crisped and inrolled above when dry, erect‑patent when wet, 1.5–2 x 0.3–0.5 mm, lanceolate to lingulate‑lanceolate; apices acute to obtuse or apiculate; margins crenulate, plane or reflexed below, plane above, enlarged basal teeth at leaf insertion absent; costae subpercurrent to percurrent; upper interior cells rounded hexagonal to rounded quadrate, 7–12 μm, pluripapillose by 2–3 low papillae in upper ½ to _, bulging mammillose below, upper marginal cells not differentiated, basal cells 15–30 μm long, rectangular, firm‑walled, weakly porose, not tuberculate. Autoicous. Setae 7–12 mm long, smooth. Capsules 1.5–2 mm long, obovoid, furrowed, puckered at mouth; opercula erect‑rostrate, 0.7–1 mm long; annuli non‑revoluble, with fragments adhering to capsule mouth; exostome rudimentary, teeth lanceolate‑truncate, 120 μm high, hyaline, papillose, endostome absent. Spores isosporous, 22–30 μm, papillose. Calyptrae mitrate, laciniate, naked to sparsely hairy, 2–3 mm long.

 

 
 
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