r 



Clark ; Hefaticae from the state of Washington 305 



divisions. The underleaves are large and similar to the leaves in 

 the majority of cases, but they are sometimes undivided and some- 

 times show unequal segments. The leaf-cells are characterized by 

 being more or less elongated, measuring from 40-70 /-« in length 

 and from 20—30/^ in width ; they have thin walls but more or less 

 distinct trigones. The lateral branches, large underleaves, and 

 elongated leaf-cells should at once separate it from the genus 

 Cephalozia^ to which some authors have referred it, and there is 

 little probability of confusing it with any other northern genus. 



DiPLOPHYLLEiA OBTUSiFOLiA (Hook.) Trevis. 



r 



Jungermamiia obtusifolia Hook. Brit. Jung.//. 26. 1 8 16. 

 Diplophylhim obtusifoliMm Dumort Recueil d'Obs. Jung, 16. 



iS3S- 

 Diplophylleia obtusifolia Trevis, Mem. 1st. Lomb. III. 4 : 420. 



1877. 



On wet rocks. Seattle, Piper. New to the United States but 



previously reported from British Columbia. Widely distributed 



in Europe. 



The present species bears a strong resemblance to the dioicous 

 D. taxifolia (Wahl.) Trevis., agreeing with it in its rounded leaf- 

 lobes, and it is possible that the two plants have been more or less 

 confused. It is, however, somewhat smaller, and is especially 

 remarkable for its paroicous inflorescence, the antheridia in all 

 other known species being borne on special branches. In the 

 eastern United States, specimens of the recently described D, 

 apiciilaia Evans used to be referred to D, obtusifolia^ and it is by 

 no means impossible that the true D, obtusifolia may yet be detected 

 east of the Mississippi. D. apiculata may at once be distinguished 

 by its sharp-pointed leaf-lobes and autoicous inflorescence. In 

 D. albicans (L.) Trevis., which is apparently the most abundant 

 species in Washington, the plants are considerably larger, the 

 inflorescence is dioicous, and the leaf-lobes are marked by median 

 bands of elongated cells, simulating nerves in appearance. 



ScAPANiA INTERMEDIA (Husnot) Pearson 

 Scapania ne7norosa, var. intermedia Husnot, Hep. Gall. 22.//. j. 



f23. 1875. 

 Scapania intermedia Pearson, Hep. British Isles 227, //. p/. 1900. 



