1919.] The Sizth Indian Science Congress. elxi 
ance of vegetative growth. e intermediate stages in this 
series are shown by species of Cyathodium and Riccia. Most spe- 
cies of the former genus have their archegonia on the under- 
surface of the involucre as is the case in the higher types. One 
species, however, which is more reduced than the others in 
other respects also has the archegonia shifted actually to the 
u 
1905.) The antheridia in Targionia are often found on the 
dorsal surface of a vegetative shoot. The archegonia are car- 
ried to the same position in a more pronounced manner in spe- 
cies of Riccia, which is a step further than is the case with the 
species of Cyathodium mentioned above. In the higher forms of 
by the writer. It shows no trace of a median groove, no scales, 
no tuberculate rhizoids and only a slightly differentiated epider- 
mis. e absence of scales in the Indian species of Riccza is 
remarkable, the writer having come across no less than three 
such species, whereas Goebel mentions only R. erystallina, and 
even that as a doubtful case, in which scales are absent, in the 
whole of literature. 
I am afraid I have devoted a long space to the Marchantia- 
les though even now I have not touc all the important 
to follow them in detail in the other groups where moreover 
they have not been worked out in the same detail. he most 
tiales can perennate in some way and some never pro 
duce any spores at least in certain localities Two species 
of Marchantia are quite common in Lahore but I have never 
seen any sporogonia on those plants during a number of years 
that they have been under observation. The transf 
the stalk and female receptacle of the same species are pheno- 
mena of common occurrence. Similar shoots are very often 
met with arising from the male receptacle or from the base of the 
