( 105 ) 
5- or 6-angled, 16-30 yw, with pronounced trigones, cuticle 
smooth or very slightly roughened. (Plate 14.) 
On rocks, Crater Lake, at foot of Chilcoot Pass, altitude 
about 900 m., May 24, 1898. Although Mr. Williams’ speci- 
men is wholly sterile, the peculiarities of the species are so 
striking that we think our description and figures will make 
possible its easy recognition. We are unacquainted with any 
Scapania which seems closely related to this species. Sca- 
panta Kaurint Ryan, from Norway, has obtuse, entire or 
subentire leaf-lobes but here the resemblance ceases, for 
S. Kaurint is a much smaller plant in every way, its leaves 
increase in size toward the stem-apex, are commonly sub- 
vertical, and are less deeply lobed, the dorsal lobes are not at 
all imbricate unless at the very apex of the stem, the ventral 
lobes are ovate or obovate, the root-hairs are numerous, etc. 
The arrangement of the leaf-lobes in Scapaniza imbricata is 
quite suggestive of the genus Diplophylleza, yet the plant is 
doubtless a true Scapanza. 
Explanation of Plate 14. 
Figs. 1 and 2. Stems (secondary), natural size. 
Fig. 3. From near base of stem, dorsal view, 7. 
Fig. 4. Apical portion, dorsal view, x 7. 
Figs. 5 and 6. Portions of stem _with typical leaves, dorsal view, 12. 
Figs. 7 and 8. Same portions, ventral view, 12. 
Figs. 9 and ro. Single leaves viewed from outer (lower) surface, 12. 
Fig. 11. Leaf cells from apex of ventral lobe, showing margin, 245. 
Fig. 12. Leaf-cells from middle of ventral lobe, * 245. 
Fig. 13. Cross-section of (secondary) stem,  4o. 
Fig. 14. Cells from near surface in cross-section of (secondary) stem, 
245. 
2. An Enumeration of the Mosses collected. 
By R. S. WILLIAMS. 
Our party arrived at Dyea, Alaska, March 23, 1898, and a 
day or two later a few specimens of mosses were collected in 
the immediate vicinity, from which time on collections were 
made at intervals as opportunity offered till Dawson was 
reached on the 21st of June. On our arrival the streets of 
