(119) 
Orthotrichum rupestre Schleich. Lake Lindeman (618). 
Orthotrichum alpestre Hornsch. Lake Marsh and Daw- 
son. On rock (619). 
Orthotrichum spectosum Nees. Skagway, Alaska. On 
cotton-wood (620). 
Orthotrichum obtustfolium Schrad. Skagway. On cot- 
ton-wood (621). 
Leersia rhabdocarpa (Schwaegr.)Lindb. (Encalypia rhab- 
docarpa Schwaegr.) Dawson (623). 
Leersia Selwyni (Aust.) E. G. Britt. (Aucalypia Selwynt 
Aust.) Lake Marsh; also common about Dawson (624). 
Georgia pellucida (L.) Rab. (Tetraphis pellucida (L.) 
Hedw.) Lake Lindeman (625). 
Georgia geniculata (Girgens.) Lindb. (Tetraphis genicu- 
Jata Girgens.) Cafion City, Dyea Creek (626). 
Dissodon splachnotdes (Thunb.) Grev. & Arn. Lake 
Lindeman. A few specimens found growing on damp earth 
by margin of pond. The rhomboidal leaf-cells a little below 
the apex measure .O10 mm. by .025 mm., toward base be- 
coming rectangular with a width of about .oo8 mm. and from 
4 to 6 times longer. Spores up to .036 mm. Synoicous 
(627). 
Tetraplodon angustatus (Sw.) B. & S. Dawson. On 
bones. In good fruit, May 7. This species often grows 
mixed with the next and is scarcely to be distinguished by 
the unaided eye, unless by the little shorter pedicel. The 
stomata are confined to the upper end of the apophysis, the 
teeth approximate in fours, not in twos, as given in the L. & 
J. Manual (805). 
Tetraplodon bryoides (Zoeg.) Lindb. ( Zetraplodon mnio- 
ides (Sw.) B. & S.) Dawson. Onbones. In fine fruit, July 
3. The stomata are scattered over the apophysis and teeth 
approximate in twos (628). 
Tetraplodon urceolatus (Brid.) B. & S. Near summit of 
Moosehide Mt. just back of Dawson. On bones. In a letter 
recently received by Mrs. Britton from Mr. H. N. Dixon, 
speaking of the differences between 7. mnzocdes cavifolius 
