Campylopus chrismari

Campylopus chrismari (C. Mull.) Mitt. Jour
•Linn. Soc. 12 : 88. 1869.
Dicranum areodictyon C. Mull. Syn. 1: 394, in part. 1848.
Dicranum Chrismari C. Mull. Bot. Zeit. 13: 761. 1855.
Dicranum destructile C. Mull. Bot. Zeit. 17: 220. 1859.
Dicranum f Habile Hampe; C. Mull. Bot. Zeit. 17: 220. 1859.
Dicranum Krauseanum Hampe & Lorentz; Hampe, Bot. Zeit. 27: 434. 1869.
Campylopus destructilis Jaeger, Ber. St. Gall. Nat. Ges. 1870-71: 430. 1872.
Campylopus friabilis Jaeger, Ber. St. Gall. Nat. Ges. 1870-71: 432. 1872.
Campylopus poasensis Ren. & Card. Bull. Soc. Bot. Belg. 31 1 : 148. 1893.
Plants in compact tufts, up to 5 cm. or more high, with stems often branched above and more or less tomentose below: stem-leaves erect-spreading all round or somewhat curvedsecund, 5-7 .mm. long, from a lanceolate or ovate-lanceolate base extending into a long, tubulose nearly smooth point with a denticulate apex; costa one half to three fifths the width of the leaf -base, widening upward for a short distance, then tapering to the long-excurrent point with more or less prominent, smooth ribs on the back, in cross-section one half down showing a row of large cells on the ventral side extending about one half through, with a band of two or three rows of medium-sized cells on the dorsal side with thin walls or becoming somewhat uniformly thickened with age; alar leaf-cells few, . pale-brown or hyaline, fragile, the cells just above pale, thin-walled, more or less rectangular, broad toward the costa, narrow and elongate at the margin, forming a distinct border, the two forms merging above into shorter, irregular mostly rather thinwalled cells; perichaetial leaves rather shorter than the upper stem-leaves, the inner ones convolute more than one half up and abruptly narrowed to a slender subula, denticulate at the apex: seta 12-15 mm. long, smooth, sinuous above when dry: capsule oblong, about 2 mm. long, slightly or not curved, deeply furrowed when dry and empty, with a large annulus and a rostrate lid two thirds as long as the capsule ; exothecal cells narrow, mostly 4 or 5 times as long as broad, with much thickened lateral walls and thin endwalls; peristome-teeth dark-red, closely articulate and striate below, divided to below the middle: calyptra not ciliate at the base: spores slightly rough, up to 13 y in diameter.
Type locality: Mexico.
Distribution : Mexico, Costa Rica, and Guatemala; high alpine. g This species is much like C. areodictyon (C. Mull.) Mitt., of northern South America, but distinguished at once by the cross-section of the costa, C. areodictyon having a stereid-band both above and below the median row of cells; it also has longer, narrower cells in the upper part of the short leaf -blade. The ribs on the back of the costa in C. Ckrismari vary greatly, sometimes being very prominent, at other times scarcely distinct, in specimens from the same tuft.