HEPATIC^E. 
(Liver-worts or Scale Mosses.) 
The British Jungermanice^'' published 1816, by Sir 
W. J. Hooker, is one of the best monographs of these 
plants that was ever written up to that date, and contains 
beautiful drawings illustrating all the species (81) then 
known in the British Isles. This fine work gave an impetus 
to the study of these, many of them minute plants, which are 
so well represented in this country. 
Sir James Edward Smith's Evglish Flora,'" vol. 5, 1844, 
contains class 24, Cryptogamia, by Sir W. J. Hooker. 
Part I contains the Hepaticse, which are included in six 
genera ; there are five genera in the Marchantia group 
which have thalloid growth, viz., Riccia, Sphserocarpus, 
Anthoceros, Targionia, and Marchantia, with twelve 
species, all the others are included by Hooker in the genus 
Jungermania in two divisions. i. Foliaceous, with 74 
species (all having distinct stems and leaves). 2. Frondose^ 
with 7 species. This work contains the excellent descriptions, 
without the fine drawings, from the earlier monagraph of 
Hooker, which is now a scarce and expensive book. 
In this section of the Bryophyta the first separation of 
plants from a thalloid growth to those with distinct stems 
and leaves takes place. Hooker, however, subdivided the 
large genus Jungermania L. into several sections. Some 
subsequent writers on these plants have largely increased 
the number of genera, many of which correspond to Hooker's 
sections of the single genus, Jungermania. 
Dr. Taylor, of Dunkerroon, co. Kerry, Ireland, was one 
of the early students of the Hepaticae, and was a co-worker 
with Hooker in publishing the '''' Muscologia Britannica^'' 
January, 1906 591 
