ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
555 
mosses, and ferns, in the large nucleus, and the small amount present of 
cytoplasm and chloroplasts. The young oogones contain a large number 
of nuclei, distributed nearly uniformly. A portion of the protoplasm 
subsequently retreats into the supporting filament, carrying with it the 
chlorophyll-bodies and nearly all the nuclei. Only a single nucleus,^ 
the future oosphere, remains in the oogone, which then becomes shut off 
by a septum. The protoplasm, which is ejected when the oogone opens, 
contains no nuclei, and cannot be regarded as a directing sphere ; its 
purpose appears to be merely the forcing open of the cell. 
Abnormal Vaucheria.* * * § — Miss M. A. Nichols records examples of 
abnormal fruiting in Vaucheria geminata var. racemosa, in which (1) the 
oogones are absorbed, leaving stump-like protuberances on the fertile 
branch; (2) the oogones are prolonged into vegetative filaments; (3) 
fully developed antherids were produced in places normally occupied by 
oogones. 
Bryopsis.l — Miss E. S. Barton describes a new species of Bryopsis 
from British Kaffraria, B. Flanagani ; also a peculiarity in the mode of 
growth of B. capressina from the Cape, in which the hapters of different 
specimens interlace with one another, causing the younger plants to 
cling to the stem of older ones, and giving the species an appearance of 
branching. 
Cohn’s Hsematochrome.J — Dr- W. Zopf has studied the pigment of 
Hsematococcus pluvialis, which Cohn described as hsematochrome. Besides 
chlorophyll, there is in this alga a red carotin with one absorption band, 
and a yellow carotin with two absorption bands. The yellow carotin is 
characteristic of Trentepoklia Iolithus, and was lumped by Cohn along 
with the red carotin. Zopf rigidly distinguishes the two, and calls the 
yellow eucarotin. Apart from this, the paper also contains numerous 
important notes on pigments. 
Eungi. 
Astreptonema, a new Genus of Saprolegniaceae.§ — Under the 
name Astreptonema longispora g. et sp. n., Herr P. Hauptfleisch describes 
a parasitic fungus found in the rectum of Gammarus locusta. The life- 
history is but imperfectly known, but the following diagnosis is given ; — • 
Thallus non racemosus; una tantummodo ovospora in ovogonio nata, 
quasi explens ovogonium ; ovosporse plurium nuclearum, oblongae, 2*26 
X 7-10 /x ; ovogonia terminalia, semper simplici serie adnexa aliud alii, 
non transfusa. Sporangia incognita ; antheridia desunt. 
Diseases of Plants caused by Cryptogamic Parasites.|j — Herr B. 
von Tubeuf has recently brought out a work which is intended as an in- 
troduction to the study of parasitic fungi, Mucedinese, Schizomycetes, 
and algae, and also as a guide to the prevention and treatment of the 
diseases of cultivated plants. The work is essentially a phytopatho- 
logical mycology. It is well got up, and is divided into a general and 
* Bot. Gazette, xx. (1895) pp. 269-71 (1 pi.). 
f Journ. of Bot., xxxiii. (1895) pp. 161-2 (1 pi.). 
X Biol. Centrabl., xv. (1895) pp. 417-27. 
§ Ber. Deutsch. Bot. Gesell., xiii. (1895) pp. 83-8 (1 pi.). 
|| ‘ Pflanzenkrankheiten durch kryptogame Parasiten verursacht,’ Berlin, 600 pp. 
and 306 figs. See Centralbl. f. Bakteriol. u. Pavasitenk., 2 te Abt., i. (1895) pp. 510-1. 
