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Dicranodontium costaricense

Comprehensive Description

provided by North American Flora
Dicranodontium costaricense (C. Mull.) R. S. Williams
Leptotrichum costaricense C. Mull. Bot. Zeit. 16: 161. 1858. Atractylocarpus mexicanus Mitt. Jour. Linn. Soc. 12: 71. 1869.
Leptotrichum leptocarpum Schimp.; Besch. Mem. Soc. Sci. Nat. Cherbourg 16: 174. 1872. heptoU'ichwm mt ' Xiian unr'B'esc h. M6m. "See^-Seiv-N-at^Cbefbou4:g4-6-^4Z5 Dicranum Pittieri Ren. & Card. Bull. Soc. Bot. Belg. 31 1 : 146. 1893. Dilrichum leptocarpum Hampe; Paris, Index Bryol. 394. 1895.
'.Nat. PH. 1 3 :337. 1901. j.
AutoicousT male "flowers on/very short branches a little below the archegonium, often 3 or 4 together, the inner perigonial leaves short, ovate, narrowly, often faintly costate, enclosing 6-8 antheridia about 0.25 mm. long, with paraphyses slightly longer: plants in broad yellowish to dark-green mats, with stems 1-2 cm. high bearing more or less falcate-secund leaves 5-7 mm. long: stem-leaves lanceolatesetaceous, subtubulose, serrulate on the margins and back nearly one half down, the leaf -blade vanishing about one half up; costa one half the width of the lower part of the leaf, in cross-section near the base showing, on the dorsal side, a rather narrow stereid-band interrupted by the large outer cells, on the ventral side often only 3 or 4 cells above the guide-cells but becoming more numerous up near the middle of the leaf where a narrow band of stereid-cells may be developed below the outer cells; alar cells hyaline, fugacious, not forming auricles, the cells of the lower part of the blade rectangular, with thin not pitted walls, those toward the costa 12-16 ju wide and 30-60 n long, smaller and narrower toward the margin, not forming a distinct border; inner perichaetial leaves about the length of the outer, from a convolute base extending, about one third up, rather gradually narrowed to the rough point: seta straight or somewhat flexuous, 8-15 mm. long: capsule cylindric, erect, smooth, when dry without stomata, 2.5-3.5 mm. long; annulus large, compound; peristome-teeth slender, about 30 /x wide at the base and 325 p long or more, separate to below the •mouth, divided almost to the base into terete forks, the articulations often indistinct, papillose or the outer plates near the base more or less vertically striate; lid with a rostrate beak one half to two thirds the length of the capsule: calyptra often reaching to the base of the capsule, split on one side from above the middle to the base or only part way down as in D. alpina: spores smooth, about 12 y. in diameter.
Type locality : Las Nubes, Costa Rica. Distribution: Mexico, Costa Rica, and Guatemala.
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bibliographic citation
Robert Statham Williams. 1913. (BRYALES); DICRANACEAE, LEUCOBRYACEAE. North American flora. vol 15(2). New York Botanical Garden, New York, NY
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