308 : The Botanical Gazette. ~ [October, 
northern Europe and Americ 
As might be expected certain northern hemisphere 
genera predominate. The genera Jungermania, Scapania, 
Marsupella and Cephalozia form 41 per cent. of the Hepaticae 
of all Europe, while the same genera of the northern portions 
form 46 per cent. of the species. For America the corres- 
ponding per cents are twenty-five and thirty-seven. Forty- 
seven per cent. of the flora of northern Asia ‘is made up of 
the three genera, Jungermania, Cephalozia and Scapania, the 
genus Marsupella being strangely absent from that. flora. 
Some comparisons of the larger genera will show more clearly 
the tendency of certain genera to increase relatively north- 
ward:— : 
EUROPE. AMERIE 
pave seers AR. ——, ee ee 
Per cent of Per cent of Per cent of Bache =! 
Genera. all species. boreal spec. all species. 
BUICCIg SS i a GQ Qe OO ee 
ura, ES cian 2 ine ae ; 
ephalozia, 7 3 4.3 
RoMblaAnine Oe S85 Bae) By pedo ee Sr peo Oa - 55 
Jungermania, . . 19 OS TL SEBS ae Stem ae 
Lejeunea, . Fah ie Sess is on 7.6 24 
Marsupella, De: fee 1.6 : 
ardia, 32 2.3. 2.6 ay 
Radula, Rae 0.6 . 3-6 3 
weapania NN Gig ee 6.3 3 
While the above table shows 
$2 oy ot eae os SS eee 
the relative increase of such 
northern genera as Aneura, Cephalozia, Jungermania, sae? 
pella and Scapania, it also shows the relative bye ei 
such warm temperate and tropical genera as Riccia, Fru nat 
Lejeunea and Radula. It also shows the excessive ne: z 
ment of Frullania and Lejeunea in America, and that of CeP. 
alozia, Marsupella and Jungermania in Europe. lca 
7. The ninety-eight north Asiatic species are distribN’ 
F nly are 
8. Of the boreal species of Europe two gen 
not represented in either America or Asia. 
seas -- Riella, Tessellin® 
the European genera of lower latitudes Corsinia, Rie payllam have 
Acrobolbus, Adelanthus, Calypogea, Gymnoscyphus and Peta 
ica. ' 
not been found in Ameri 
