Cal, Gray Manual Region, 
Total No. of Species a9 145 
In common with the British Isles 34 0r44 % 78 or 54% 
In Central and Northern Europe 490152 %& QI or 63% 
In Mediterranean Region 45 or 58%% 78 or 54% 
Peculiar to Pacific Coast 26 or 34. % 
In common with the Gray Man. Reg. 37 or 48 % 
Peculiar to Gray Manual Region 40 or 28% 
In common with California 32 or 22% 
It will be seen that the hepatic flora of California has more in 
common with that of northern and central Europe than with the 
eastern United States, and is still more allied to that of the Medi- 
terranean region. In particular species of Aséerella and Riccia 
are better developed in California and southern Europe than in 
the eastern United States. 
The apparent absence in California of Bazzania and Myla 
which are especially characteristic of medial and boreal regions, © 
serves to heighten the similarity to southern Europe. - 
The paper was followed by exhibit of photomicrographs of 
sections of Cryptomitrium, illustrating the development of the 
archegonia. 
Discussion by Prof. Underwood, Prof. Britton and others fol- 
lowed. Prof. Underwood, in answer to inquiry as to the region 
where the Hepaticae are most abundant, suggested the Amazon 
region and the eastern slope of the Andes, also Java. Insular 
tropical regions have furnished many where examined, as Cuba 
and Jamaica, Quite a number are peculiar to Australia. New 
Zealand is well supplied with them. Many have been recently 
collected in Africa, and have been described by Herr Stephani of 
Leipsic, whose industry has doubled the number of described He- 
paticae. As a whole the maximum development of the Hepaticae 
is tropical, though some genera and certain groups within genera 
are wholly high-temperate or subarctic. 
Prof. Britton remarking the indications of circumboreal and 
circumtropical distribution of certain species, referred to the argu- 
ment for an equatorial distribution of flowering plants and of 
ferns, and queried if there were anything corresponding among 
Hepaticae. 
