292 FRYE 
Upper leaves erect to patent, when dry more or less closely applied 
to the stem, narrowly lanceolate to awl-shaped from a thin sheath- 
like base, smooth at back; lamina 1 cell thick, but narrow. Margin 
not bordered, slightly if at all incurved, mostly sharply toothed to 
hairy above (not hairy in North American species). Lamellz on 
upper side only, numerous, not wavy from side to side, entire, mar- 
ginal cells mostly somewhat enlarged and somewhat oval. Vein 
broad outside of sheath, excurrent as a red point. Cells of sheath 
without chlorophyll, elongated-rectangular to linear, narrower 
toward the margin; cells of limb iso-diametric, thick walled. 
Calyptra cucullate, usually with short hairs at tip, sometimes 
smooth. 
Capsule inclined, oblong or ovate, 2—4 angled, smooth, often 
semilunar in cross section, with numerous 2-celled stomates. Peri- 
stome present; teeth pale, with yellowish axis. Lid conic, more or 
less beaked. Pedicels single or two on a tip, elongated, thick. 
Number of species in western North America, 1; total number of 
species, about 18. 
1, Polytrichadelphus lyallii Mitt.,in Journ. Linn. Soc. 1864, p. 40. 
Oligoirichum lyalli Lindb., in Act. Soc. pr. Fauna et Fl. Fenn, 1868, 
[Bs KO, 
Polytrichum angustidens Lindb." in Bot. Centralb. Vol. 84. 
Named after Lyall.” 
Plants robust, dirty yellow to brownish green. Stems fastigiately 
branching from the middle, sometimes simple, naked at the base, 
densely foliate above. 
1 Prof. J. M. Holzinger, of Winona, Minnesota, kindly sent some Polytrichum angus- 
tidens Lindb., co-type material, No. 1121 of the collection by Sandberg in northern 
Idaho. A comparison of this with Polytrichadelphus lyallii Mitt. indicates that they 
are the same. ‘The leaf characteristics even down to the marginal cells of the lamellz 
agree. The number of lamelle is 35-45. The capsules sent were young and shrunken; 
the angles cannot therefore be made out with certainty. Lindberg says, ‘“‘capsules 
acutely 4-angled,” but if his material was likewise young and shrunken, one could 
easily surmise an error here. The other capsule characteristics agree with Polytricha- 
delphus lyallit. The calyptra would at once distinguish Polytrichum from Polytricha- 
delphus, but it is wanting in the writer’s material; since Lindberg omits it in his 
description, one surmises it was wanting in his as well. More evidence is necessary 
to convince the writer that Polytrichum angustidens is not Polytrichadelphus lyallit. 
2 David Lyall, surgeon and botanist attached to international survey. 
