238 The Botanical Gazette. [April 
not observed the ¢ha//us of the Myxomycetes to be written even in the 
text-books. 
The use of the term ¢ha//us is now practically confined to the Lichens 
and more especially to the thin flat expansions, either foliaceous or 
crustaceous of the vegetative system. Its use in this same senseis 
transferred to certain plants not only among the Algee but also in the 
Hepatice. Here, however, the better term would be shallode. Hence, 
so far as the usage of systematic works is concerned, the denomination 
Thallophyta of the text-books applies only to the lichens. 
Finally, it is with some amazement that I view the new systems of 
classification in the most recent text-books. In the lower cryptogams 
there is an evident recoil to the Alge and the Fungi, if not of Lin 
naeus, of Agardh and Fries. This is a return to a consideration of 
the vegetative system of these plants instead of the reproductive. 01 
this account it would seem necessarily to involve the setting apart 
again of the lichens, whose vegetative system is now known to | 
unique among plants. Up to date, then, the gain in general classifi- 
cation has been only to segregate the Myxomycetes as an independent 
class. But in the development of the subordinate members of the 
scheme, the progress has been wonderful, though it is not yet by any 
means complete.—A. P. Morean, Preston, O. 
cards. The average monthly issue for 1894 was 49 cards, for 1895 8 
eon The total issue for 1894 and 1895 is 1,343 cards. 
n re 
by sending the committee any suggestions to this end, and particularly 
pine - adapt the work to their needs. Address the Secretary af o 
SA on Bibliography, 1286 Massachusetts Ave., Cambn 
ass. 
