ALGOLOGICAL LITERATURE OF 1899 137 
Freeman, and ‘‘ Observations on Rhodymenia,” by F. K. Butters. 
Mr. Freeman sums up our knowledge of Chlorochytrium, and 
ich 
that this is a young state o 
Specimens of C. inclusum found upon Dilsea in Phycotheka Boreali- 
Americana, fase. xi. no. 5 These he regards as possibly a 
resting-stage of the plant, the more so as they were collected in 
December, while his plants were gathered in the summer months. 
He then explains the differences between the two forms. ‘+ Obser- 
vations on Hhodymenia”’ were apparently worked out on R. pertusa, 
though, as this is not directly stated, it can only be inferred. The 
paper contains no point of special interest. 
The Annals of Botany for March contains a paper on Harveyella 
mirabilis by Mr. Sturch. The author has studied this parasite from 
its earliest growth, and is of opinion that Choreocolax albus Kuck. is 
merely the tetraspore-bearing form of Harveyella. He describes the 
formation of antheridia, cystocarps, and tetraspores, and figures the 
various stages. ‘Till now the antheridia have always been described 
as occurring on small flat fronds, but Mr. Sturch finds the antheridial 
thallus is ‘‘ frequently as large and spherical as the mature cysto- 
carpic fronds.” Though the vegetative filaments inside the host 
appear to grow only between the walls of the host-cells, the author 
has seen ‘distinct protoplasmic threads connecting the cell-contents 
of these filaments with the cell-contents of the Rhodomela.” This 
result was attained by staining glycerin-material with Hoffman's 
blue. Thus the cell-contents of the host are gradually absorbed, 
after having been surrounded by the parasitic filaments. As the 
result of his investigations, the author removes the genus Harveyella 
from Gelidiacee and places it in Gigartinacea, owing to the develop- 
ment of its auxiliary cell before fertilization; at the same time 
transferring Choreocolax provisionally to the same order. 
given to the subdivisions of Gigartinacee, and, finally, the ques- 
tion of temperature is dealt with in connection with the seasonal 
appearance of Harveyella. 
on Actinococcus in a paper ‘‘On Actinococeus an yllophora”’ pub- 
Journat or Borany.—Vou. 38. [Apriz, 1900.] L 
