Yale University Herbarium

YU.233882

HERBARIUM OF
YALE UNIVERSITY.

North America Musci Pleurocarpi.

ISSUED BY A. J. GROUT, PH. D.

196. Plagiothecium Groutii

Card. & Theriot. Bot. Gaz. May 1904.

(Type collection.)

Depression in base of old chestnut tree,
Hempstead, L. I., Dec. 1, 1899.

Coll. A. J. G.

Det. J. Cardot.

um!" I believe it a new species which is more at home in *Raphidostegium* because of the enlarged alar cells in some of the larger plants. The smaller size, the shorter less slenderly acuminate leaves with alar cells much less strongly developed, complanate but not recurved and only very slightly unsymmetric, and the smaller capsules with shorter beak, seem to me so distinctive as to make this form worthy of specific rank. It hardly seems depauperate as it was growing with typical *R. recurvans* in a favorable spot (possibly a little dry at times) and besides it is fruiting freely. There is a little *R. recurvans* intertangled with it.