Trichostomum hondurense Allen, sp. nov.
Type: Honduras. Santa Bárbara: East slope of Mt. Santa Bárbara, trail to minor peak, ca 7 km N of El Mochito, 14°55'N, 88°07'W, Allen 11625 (holotype MO; isotype TEFH).
Species haec a T. tenuirostri linearibus, incrassatis, interdum porosisque basalibus cellulis foliorum differt.
Plants medium-sized, yellow-green to green above, red-brown below, in tufts, to 20 mm high. Stems red, erect, sparsely and irregularly branched, hyalodermis absent, central strand present,; rhizoids sparse, clustered at base, thick, red-brown, smooth; axillary hairs with to 12 uniseriate, long-rectangular to oblong upper cells and 1–2 short-rectangular basal cells. Leaves 2.5–4 mm long, lanceolate, falcate, erect and appressed to stem at base, incurved-contorted, curled above when dry, erect-spreading to flexuose when wet; apices acute, long-mucronate; lamina unistratose, at times fragile and broken above; margins lightly serrulate to denticulate at leaf shoulders, entire above, plane or erect, somewhat undulate; costa stoutly excurrent, mucro to 280 μm long, guide cells and two stereid bands well-developed, ventral surface layer enlarged, papillose; upper cells rounded-quadrate, to short-rectangular, 8–14 x 4 μm, firm-walled, papillae multiplex, fused into a very thick, flat cap completely covering the lumina and obscuring the cell walls, basal cells long, narrowly rectangular to linear, thick-walled throughout, at times porose, yellowish, smooth, shorter and thicker-walled in upper part of base, 20–40 x 12 μm, outer basal cells not running up the margins in a v-shaped pattern. Dioicous. Setae elongate, red, capsules unknown.