Macromitrium guatemalense C. Müller 1851

Macromitrium guatemalense* C. Mull
Syn. 2:644. 1851.
Macromitrium Trianae C. Mull. Bot. Zeit. IS: 580. 1857.
Macromitrium penicillatum Mitt. Jour. Linn. Soc. 12: 217. 1869.
Macromitrium tortuosum Schimp.; Besch. Mem. Soc. Sci. Nat. Cherb. 16: 189. 1872.
Macromitrium paucidens C. Mull. Iinnaea 42: 487. 1879.
Macromitrium rhysiophyllum C. Mull. Bull. Herb. Boiss. 5: 198. 1897.
Macromitrium subreflexum C. Mull. Bull. Herb. Boiss. 5: 198. 1897.
Plants robust, in dense, wide, dark green mats, lighter green at the growing points ; secondary stems radiculose below, densely foliate, up to 2 cm. long, somewhat branched; leaves strongly crisped when dry, erect-spreading to somewhat recurved when moist, about 2 mm. long, oblong-lanceolate to lanceolate, strongly keeled, rather broadly but sharply acute, the margins sharply toothed near the apex to nearly entire, often with coarse, hyaline teeth at and near the insertion, undulate above and recurved below, at least on one side; costa nearly or quite percurrent; upper leaf -cells roundedquadrate, 5-7 m in diameter, more or less mammillose, gradually merging into the linear, very strongly tuberculate basal cells, all strongly incrassate; outer basal cells narrowly linear, mostly smooth; perichaetial leaves narrowly longacuminate, smooth, entire, the upper cells elongate; dioicous; seta smooth, up to 6 mm. long; capsules ovoid, strongly ribbed when dry, becoming smoother with age, the urn up to 2 mm. long; calyptra without hairs, covering most of the capsule, deeply laciniate; operculum slenderly rostrate from a conical base, shorter than the urn; peristome double, the outer a truncate cone of well developed teeth more or less united but each showing a median line, transversely segmented, papillose; inner peristome a divided membrane of equal length; spores about 25 n in diameter, finely papillose.
* as "guatemaliense"; here regarded as an orthographic error. „,, TypE locality: Guatemala (? Frederichsthal, comm. Kegel; specimens so labeled and in addition M. guatemalense mihi" m herb. N. Y. Bot. Gard. have been examined).
Distribution: On twigs and bark, occasionally on rock; Mexico; Central and South America; Galapagos Islands {Alb an Stewart 8713b in herb. N. Y. Bot. Gard.).