A. W. Evcms — North A7nerican Species of F7nilla7iia. 21 



branch-underleaves 0-1 V™™ long, 0'15™™ wide ; leaf-cells at edge of 

 lobe 0-014™™ in the middle 0-019""" in diameter and at the base 

 0-035™™ long, 0-023™™ wide ; bract I, lobe 1-50™™ long, 0-75™™ wide, 

 lobule 0-60™™ long, 0-25™™ wide; bracteole I, 1-35™™ long, 0-60™™ 

 wide ; bract II, lobe 1-25™™ long, 0-50™™ wide, lobule 0-40™™ long, 

 0-20™™ wide ; bracteole II, 1-00™™ long, 0-50™™ wide ; perianth 2-20™™ 

 long, 100™™ wide. 



On trees ; California. Distributed (as IP. Nlsquallensis) in Hep. 

 Bor.-Amer. n. 108 (in part). 



The plants of the present group have long been a j)uzzle to Ameri- 

 can hepaticologists ; most of them are species of wide range, they 

 vary greatly according to environment and are apparently connected 

 with one another by transitional forms. In sterile material, more- 

 over, the essential characters of a species are often so slightly 

 developed as to make determination difficult if not impossible, and 

 the same thing is true, though in a far less degree, of antheridial 

 material. In the eastern parts of the United States the only com- 

 mon representative is Frullanla Asagrayana, a plant which fre- 

 quently assumes forms very unlike the specimens originally described 

 by Montague : the most important differences brought out in this 

 description between our plant and F. Taniarisci are in the under- 

 leaves, which are said to be plane, and in the perichietial bracts, 

 which are said to be subentire. Neither of these characters is con- 

 stant ; the underleaves may be reflexed, and the bracts ai-e some- 

 times dentate. The underleaves, nevertheless, do afford us a second 

 and more important distinction in the basal auricles or lobes some- 

 times found in F. Asagrayana ; these are never crispate as in the 

 constant and well developed auricles of F Tamarisci. The stylus 

 of F. Asagrayana is unusually large, being sometimes as long as 

 the lobule. A somewhat similar stylus is sometimes found in other 

 species of this group, but it is always smaller than in F. Asagrayana ; 

 and, in F. Tamarisci, it is more or less crispate like the auricles of 

 the underleaves. In F Asagrayana, finally, the lobules of the peri- 

 chsetial bracts and usually also the bracteoles bear at the base more 

 or less distinct, laciniate segments : these reappear in the western F. 

 Californica, but are unlike the equivalent structures found in our 

 other species. 



In the far north the closely related F. Tamarisci, which is abun- 

 dant in Europe, apparently becomes more common, sometimes 

 occurring in company with F. Asagrayana. The most important 

 points of difference between the two are indicated above, but the 



