SCAPANIA 155 
On a log by a stream near Sisson, Siskiyou Co. (38), in com- 
pany with Aiccardia latifrons, Chiloscyphus polyanthus, and Cepha- 
(оша media, Only a few scattered gemmiferous shoots were found, 
yet we feel little hesitancy in referring them to Scapania curta, 
concerning the distribution of which in America little is at present 
known. The specimens agree closely with Rab. Hep. Eur. 93 
(“а communis, 1. forma sterilis") though the leaf-cells are some- 
what larger. The gemmae are broader than is usual in European 
forms, judging from the specimens accessible; only in G. & R. 
Hep. Eur. 382, have we found anything to equal the measure- 
ments given above. 
7. SCAPANIA HETEROPHYLLA M. A. Howe, Bull. Torr. Bot. Club, 
25: 183. 2. 330. 1808. 
Plants obscurely complanate, dark green, often bleaching at 
apices on drying, erect or ascending, forming compact cushions : 
stems 4-6 cm. high from a rhizomatous base, rigid, fastigiately and 
subdichotomously branched, brown, becoming almost black, nearly 
or wholly destitute of root-hairs, denudate below, 20-30 cells in 
thickness: leaves scarcely increasing in size upward, sometimes 
smaller at the stem-apex, the upper erecto-patent, subimbricate, 
the lower approximate, more spreading, often with squarrose tips, 
all strongly undulate-crisped both when moist and when dry, 
bilobed to the middle or bipartite, complicate, the carina acute 
or somewhat rounded, but never winged, commonly bistratose 
toward the base near the fold, the lobes sometimes almost dis- 
. united; now and then with an unlobed leaf irregularly interpo- 
lated, most frequently in the position of an underleaf; margins of 
the lower leaves commonly erose, of the upper entire or sparingly 
denticulate ; ventral lobes twice as large as the dorsal or subequal, 
1.7-2.5 mm. in length, .85—1.6 mm, in maximum width, broadly 
obovate, elliptical, or obovate-oblong, usually decurrent, mostly 
rounded-obtuse at apex; dorsal lobes obtuse, obliquely and 
broadly ovate or elliptical, not decurrent, sometimes appressed at 
stem-apex, especially on the younger shoots, but mostly ascend- 
ing or slightly squarrose-reflexed : leaf-cells generally opaque, with 
smooth or slightly roughened cuticle, near the margin subquadrate 
or roundish-hexagonal, 16—28 и, near the base oblong, 60—90 и х 
2 signs ; trigones indistinct or wanting: remaining parts un- 
know 
aen Hep. Am. 192. 
On submerged stones in a cold mountain stream (alt. 3000 ft.) 
