HEPATIC^ COLLECTED IN ALASKA 303 



the leaves are more deeply lobed with more sharply pointed divisions 

 and gibbous sinus ; the leaf-cells have very large and conspicuous tri- 

 gones, which are sometimes confluent ; gemmaj are either entirely ab- 

 sent or are extremely rare. The innermost $ bracts and bracteole 

 are more variable than the original description represents, and this 

 variability affects not only the Alaskan specimens but European 

 specimens as well. The species is apparently connned to rotten logs. 



20. Lophozia incisa (Schrad.) Dumort. 



Hot Spring, near Sitka (T.) ; Juneau (B. & C. mixed with 641, 

 691, 699, and 702, Setchell 1229, in part); Columbia Fiord (C. & 

 K. 1391, in part, 1403); Orca (T. 1444, 1491, in part, 2249); Ka- 

 diak (C. & K. 2321, in great part) ; Hall Island (T. 1442). New to 

 Alaska. 



21. Lophozia obtusa (Lindb.). 

 Jungermafinia obhisa Lindb. Muse. Scand. 7. 1S79. 



Juneau (B. & C. mixed with 693). New to America. 



There are only a few sterile stems of the present plant in the col- 

 lection, but there is little doubt that they should be referred to this rare 

 European species. The Alaskan specimens have been carefully com- 

 pared with authentic plants from Norway, kindly sent me by Dr. 

 Bryhn, and I find that they agree in all essential respects. The species 

 was first described by Lindberg from specimens collected near Stock- 

 holm, and has since been found in various other parts of Scandinavia. 

 It is known also from Styria, from Switzerland, and from Italy, but 

 has not been reported either from America or from Asia. The plant 

 is well figured by Bernet^ and is so fully described by Arnell,^ that I 

 add here simply a short account of the stem and leaf characters: 

 Creeping among other bryophytes or rarely caespitose, green ; stems 

 mostly simple, becoming more or less pigmented with age, and bear- 

 ing numerous short, whitish rhizoids : leaves distant or, more rarely, 

 subimbricated, very obliquely inserted, plane or slightly concave, ro- 

 tund, bifid about one-third with broad, mostly rounded lobes, separated 

 by a narrow, obtuse and gibbous sinus ; antical lobe subequal to the 

 postical or a little smaller, in some cases varying from rounded to ob- 

 tuse, apiculate or even acute on the same stem ; margins slightly de- 

 current, entire, or bearing a small tooth-like lobe near the antical 

 base : underleaves rudimentary and apparently often fugacious, simple 

 or deeply bifid with subulate divisions, sometimes irregularly and 



' Cat. des Hepat. du Sud-Ouest de la Suisse, pi. 4. 1S88. 

 ■2 Lebermoosstudien im uordl. Norwegen, 30. 1892. 

 Proc. Wash. Acad. Sci., October, 1900. 



