Leucobryum giganteum C. Müller 1848

Leucobryum giganteum C. Mull. Syn. 1: 79. 1849
Leucobryum robustum Sull. Proc. Am. Acad. 5: 279. 1861.
Pseudautoicous: male plants minute, usually 2-3 mm. high, borne on tomentum enclosed by the perichaetial leaves of the sterile archegonia or along the inner surface of the tubulose point of the stem-leaves; flowers solitary, the antheridial leaves few, ovate, acute, about 0.5 mm. long, enclosing 2 or 3 antheridia and few paraphyses: fertile plants in robust, loose mats, with branching stems up to 15 cm. high, bearing crowded leaves, spreading-flexuous or somewhat squarrose in the upper part, from an appressed base: stem-leaves 14-22 mm. long, from an ovate or ovate-lanceolate base gradually narrowed to a long tubulose often twisted point slightly denticulate at the acute apex ; costa in cross-section near the base showing mostly ■"$T3r~Dften~6"layers > "orcells, except near the middle, where there are usually 2 layers above and one layer below the chlorocysts; leaf-blade mostly 7 or 8 cells wide below; inner perichaetial leaves 5-6 mm. long, narrowed to a point scarcely as long~as the oblong base: seta red, up to 3.5 mm. long, solitary, appearing more or less aggregate from the crowding of the perichaetial buds on short branches, finally becoming lateral : capsule nodding, about 2 mm. long, strongly contracted, curved and ribbed when dry; peristometeeth reddish-brown, closely articulate and vertically striate below, divided more than one half down into 2 filiform, papillose forks; lid conic, with a slender beak about as long as the capsule: spores nearly smooth, about 16 p. in diameter.
Typ® locality: Colombia.
Distribution: Cuba; JamaicaBarbados; Costa Rica; also in northern South America.