96 BOTANICAL NEWS. 
Natvrat History Socrery or DUBLIN.—At the last meeting of this 
Society, Dr. David Moore, F.L.S., M.R.LA., President, in the chair, Mr. W. 
Archer read a paper on Bulbochete Pringsheimiana, sp. nov. (Oospore 
elliptic; dwarf male plants seated upon the oogonium, which they equal in 
length ; oogonium bearing immediately above it the mother-cells of the andro- 
spores.) This minute plant belongs to a family of Chlorospermatous Algæ, con- 
taining two genera, rich in forms. They are mainly but simple filamentous 
plants—that is, composed of cells following one another in a simple branched 
or unbranched linear series, and of a bright green colour. That they should 
reproduce themselves by zoospores may not be surprising, this phenomenon 
aving been now so long known in man Alge ; but they are also amongst 
those of the humbler Alge, in which, thanks mainly to Pringsheim's masterly 
researches, a true reproductive process by the mutual co-operation of distinct 
species in the GZdogoniee are by no means so numerous as are the pseudo- 
species recorded in books, on what seem to be, at least comparatively, unessen- 
tial characters. Pringsheim has indicated the plan which an observer, desirous 
to work out this group, should follow, which, if indeed it be seemingly the only 
imens in 
are fully displayed. Dr. E. Perceval Wright said he had been struck by the 
description of the cell development in Bulbochete, which differs in several re- 
bed by Karsten in Œdog 
tinet o etween a sperm, the product of a true sperm-cell, and a bud, 
which, however much it might at first sight resemble a sperm, was destined 
phytoid, in the other a zooid form ; in both, their destined function being to 
mingle their matured contents with the products of the germ-cells of the same 
