ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
667 
Exoascus Pruni on species of Primus ancl Cerasus ; Ascochyta Pi si on Pisum 
sativum , Phaseolus vulgaris , and Gicer arietinum ; Puccinia coronata and 
P. rubigo-vera on various grasses ; Fusicladium dendriticum on the apple 
and pear ; Sphserella Frag arise on the strawberry. In the same publi- 
cation the action is described of Bacillus Olese in producing cortical 
tubercles on the olive. 
Formation of a Thallus from Pycnogonids.* * * § — In various species 
of Lecideacese, especially in Catillaria denigrata and C. prasina , Ilerr 
Hedlund finds, among the pycnogonids which have been expelled from 
the pycnids, some which were germinating, and producing young myceles. 
A mature thallus of G. denigrata consists of a number of more or less 
connected warts, each of which is composed of a mass of densely inter- 
woven hyphae and a large number of gonids, which multiply by division. 
The hyphae are attached to the gonids by means of haustoria. Towards 
the surface of the lighter-coloured warts the weft of hyphae passes in- 
sensibly into young myceles which have sprung from germinating 
pycnogonids. 
Development of Colletotrichum.j — Prof. G. F. Atkinson has suc- 
ceeded in obtaining a number of pure cultures of Golletoirichum Linde - 
muthianum , the parasitic fungus which produces anthracnose in the 
bean. The spores failed to germinate in water and in ordinary agar- 
agar-peptone broth, but succeeded well when transplanted from moist 
chambers into vetch or bean-stems. 
New Genera of Fungi. — -Under the name Mylittopsis , M. 1ST. Patou- 
illard J describes a new genus of Auriculariaceae, allied to Mylitta , from 
forests in Louisiana, with the following diagnosis : — Receptaculum 
tuberculiforme, indurato-gelatinosum, e fibris radiantibus omnino com- 
positum, hymenio amphigeno ; basidiis rectis, transverse septatis, cum 
paraphysibus immixtis. 
In a collection from Brazil, Herr P. Hennings § finds a fungus which 
he makes the type of a new genus of Hypocreacese, allied to Bivonella. 
The diagnosis is as follows : — Stromata parasitica, subcrustacea, sub- 
nectriacea ; asci octospori, aparaphysati ; sporidia oblongo-ovoidea v. 
subclavata, multiseptato-muriformia, brunnea. It is named Uleomyces. 
Development of Tricholoma.|| — Sig. P. Yoglino has followed out 
the life-history of Tricholoma terreum, belonging to the Agaricinea}. 
The ellipsoidal or subglobular spores give rise to a germinating tube 
which branches in various ways, and produces narrowly ellipsoidal 
conids, and from these is developed the mycele. The mycelial branches 
produce, at the end of summer, the receptacles as well as sclerotes ; the 
latter remain dormant through the winter, and develope, in the next 
year, into new myceles and organs of fructification or receptacles. 
* Bot. Sekt. Naturv. Studentsallsk. Upsala, April 9, 1891. See Bot. Centralbl , 
lxiii. (1895) p. 9. f Bot. Gazette, xx. (1895) pp. 305-11 (1 pi.). 
X Journ. de Bot. (Morot), ix. (1895) pp. 245-7. 
§ Hedwigia, xxxiv. (1895) p. 107. 
H Nuov. Giorn. Bot. Ital., ii. (1895) pp. 272-87 (2 pis.) 
