Holomitrium calycinum Mitten 1869

Holomitrium calycinum (Sw.) Mitt. Jour. Linn
Soc. 12 : 60. 1869.
Bryum calycinum Sw. Prodr. 139. 1788. Weisia calycina Hedw. Sp. Muse. 70. 1801. Cdcalyphum /■fti/mi'riw w, Beauv. Prodr. Aetheog. 50. 1805. l/icranum calycinum Sw. Fl. Ind. Occ. 1768. 1806
Antheridial flowers not known: plants in rather compact, duskygreen or greenish-brown tufts, with branching stems up to 5 cm. high, the older branches often bearing clu sters of flagella abputj^cm^long : stem-leaves crispate when dry, mostly 5-6 mm. long, from a broadly ovate, entire base less than 2 mm. long, rather ab ruptly narrowed to a slender, serrulate, lanceolate point usually 2.5-3 times as long, with the marg in. .toward the apex of_a double thickness of cells; costa excurrent, slightly serrulate on the back near the apex, 70-80 /x wide a little above the base, in cross-section near the middle showing about 6 guide-cells with stereid-bands above and below and the outer cells differentiate d; alar cells forming a distinct, often nearly square cluster, brownish to nearly hyaline, extending about 200 p up with some much longer and narrower cells between them and the costa; cells throughout the broadened lower part of the leaf mos tly very long and narrow with thickene.dL pitied, walls, JnJthe. pointaboye .becoming much shorter with unevenly thickened scarcely pitted walls; inner perichaetial leaves with a convolute base 8-10 mm, high narrowed to a rough point mostly shorter than the base, often reaching above the capsule: seta 10-15 mm. long: capsule oblong-cylindric, smooth, brownish, up to 3 mm. long; peristome-teeth rather dark-brown, lanceolate, densely papillose, attached well below the mouth, either divided along the median line nearly to the base or sometimes undivided; lid with a slender beak about two thirds as long as the capsule: calyptra entire below, nearly or quite smooth above: spores minutely roughened, 14-16 /* in diameter.
Type locality: Jamaica. Distribution: Jamaica.