VOL.5] Hepaticae in Northern Alaska. 131 



at the base 55X35/*, innermost o bracts 1X1.4 nun., perianth 

 1.7 X 1 mm., spores 10 //. in diameter. 



Jungermannia caespiticia is a well known European species and 

 probably has an extensive range in the northern parts of 

 America. It nearest relatives are perhaps/, sphaerocarpa Hook., 

 which is already known from Alaska, and Nardia crenulata (Sm.) 

 Lindb., which is to be expected in the southern parts of the 

 Territory. In /• sphaerocarpa the inflorescence is monoicous in- 

 stead of dioicous, and the leaf-cells have distinct though some- 

 times minute trigones; the cells moreover are smaller than in 

 /. caespiticia, averaging in a Swedish specimen collected by Dr. 

 Arnell, 21 fi on the edge of the leaf, 23 /* in the middle and 30X23 

 p at the base. In Nardia crenulata (which might very justly 

 be retained m Jungermannia), the ° bracts are slightly adherent 

 to the base of the perianth, and the leaves or, at any rate, the 

 bracts are distinctly bordered with a single row of large thick- 

 walled cells. The cuticle of this species also is minutely striate- 



verruculose. 



8. Jungermannia atrovirens Dumort. Unalaska (1022, 



1026). 



9. Lophozia incisa (Schrad.) Dumort. Cape Nome (mixed 



with 2500). 



10. I.oPHOziAiNFLATA(Huds.)M. A. Howe. St. Michael 



(1801). TT , . 



11. Lophozia aTTENuata (Lhidenb.) Dumort. Unalaska 



(mixed with 1030). 



12. Lophozia Floerkii (Web. & Mohr) Schifhi. Unalaska 



(mixed with 1016). 



13. Plagiochila asplenioides (L.) Dumort. Unalaska 



(1030). 



14. Chiloscyphus polyanthos (L.) Corda. Unalaska (mix- 

 ed with 102 1). 



15. Cephalozia divaricata (Sm.) Dumort. Unalaska 



(mixed with 1016). 



The specimens show ° flowers with occasionally an immature 

 perianth. On some of the stems, the upper leaves are more than 

 one cell thick near the base and occasionally exhibit on the outer 



