ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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differs widely according to tlie tissue of the host-plant which they 
inhabit. The membrane of the mycele-filaments is usually stratified. 
They are frequently characterised by the formation of warts, plugs, or 
rings of cailose, which sometimes constitute septa ; and in this respect 
they display a resemblance to pollen-tubes. 
The hausloria are characterised by the presence of a sheath, winch 
brings about an immediate contact between the haustorium and the 
living cell-contents of the host-plant. The nutrition of the parasite 
takes place only by diffusion through this sheath. 
The conidiophores and the basids of the Cystopese consist simply of 
cellulose, and are never cuticularised. In the basids the cellulose forms 
a coating on the inside of the cell-wall. The membrane of the oogone 
may resemble that of the mycele, or may be simply enclosed in a very 
delicate envelope of pure cellulose. The endospore of the oosperm is 
always thick, is composed of an intimate compound of cellulose and 
cailose, and breaks up more or less easily into two or more layers ; 
while- the exospore is composed entirely of nitrogen-compounds, and is 
entirely destitute of cellulose, or contains only a very small quantity of 
one or both. 
New Genera of Fungi. — Under the name Lasiodiplodia tubericola 
g. et sp. n., Miss Ida Clendenin * describes a parasitic fungus found on 
the sweet potato, and belonging to the Ascomycetes. The genus agrees 
with Diplodia in other points ; but the peritheces arc collected into a 
stroma clothed with brown mycele ; the basids and sporules are inter- 
mingled with paraphyses. 
M. E. de Wildeman f describes the following new genera : — Lageni - 
opsis (between Ancylistese and Peronosporese). Thallus furnished with 
a membrane, unicellular, filamentous, usually simple; oogone deve- 
loped at any point of the thallus, nearly globular, not separated by a 
septum ; antherids smaller than the oogones and the same in number • 
oospores globular or elliptical, with thick membrane. L. reducta, on 
oogones of Cliara. 
Achly opsis (affinities uncertain). Thallus filamentous, branched, uni- 
cellular, rarely scptated ; oogones globular or elliptical, at the extremity 
of branches, and separated by a septum ; antheridial filaments numerous, 
sometimes completely surrounding the oogone ; oosperm solitary, com- 
pletely filling the oogone. A. entospora, on oogones of Cliara. 
P lasmopar opsis (Phycomycetes). Parasitic or saprophytic ; thallus 
filamentous, branched, with a rigid dichotomous portion rising above the 
substratum ; oosporanges borne on short lateral branches. P. rigida, on 
oogones of Cliara. 
Parasitic Fungi.— Herr A. Nilsson + describes the ravages com- 
mitted in the pine forests of Sweden by the attacks of various species of 
Polyporus, — P. Pint, annosus, pinicola ) vaporarius, mollis, and borealis. 
Herr J. Van Breda de Haan § gives full details of the structure and 
* Bot. Gazette, xxi. (1896) p. 92 (1 pi.), 
t Ann. Soe. Beige Micr., xx. (1898) pp. 105-38 (7 pis.).] 
X Tidskr. f. Skogsliushallning, 1896, 15 pp. .See Bot. Centralbl., lxvi. (1896) 
p. 328. ' v ' 
§ ‘Die Bibitzichte in de Deli-Talak,’ Batavia, 1896. See Bot. Centralbl., lxvi 
(1896) p. 361. 
