("9) 



Ortkotrickum rupestre Schleich. Lake Lindeman (618). 

 Orthotrichum alpestrc Hornsch. Lake Marsh and Daw- 

 son. On rock (619). 



Orthotrichum speciosum Nees. Skagway, Alaska. On 

 cotton-wood (620). 



Orthotrichum obtusifolium Schrad. Skagway. On cot- 

 ton-wood (621). 



Lecrsia rhabdocarpa (Schwaegr.) Lindb. [Encalypta rhab- 

 docarpa Schwaegr.) Dawson (623). 



Leersia Sehvyni (Aust.) E. G. Britt. [Encalypta Selwyni 

 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- 

 lates Girgens.) Canon City, Dyea Creek (626). 



Dissodon splachnoides (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 .010 mm. by .025 mm., toward base be- 

 coming rectangular with a width of about .008 mm. and from 

 4 to 6 times longer. Spores up to .036 mm. Synoicous 

 (627). 



Tctraplodon 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. {Tctraplodon nui/'o- 

 ides(Sxv.) B. &S.) Dawson. On bones. In fine fruit, July 

 3. The stomata are scattered over the apophysis and teeth 

 approximate in twos (628). 



Tetraplodon nrceolatus (Brid.) B. & S. Near summit of 

 Moosehide Mt. just back of Dawson. On bones. In a letter 

 recently received by Mrs. Britton from Mr. II. N. Dixon, 

 speaking of the differences between T. mnioides cavifolius 



