650 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
The cholesterins are apparently different in the two species, and are 
clearly distinct from animal cholesterin. 
Nuclei in the Mucorini.* * * § — In Phy corny ces nitens , Thamnidium 
elegans , and Chsetocladium Fresenii , M. A. De Wevre finds minute 
rounded or fusiform bodies, immersed in the protoplasm, not more than 
1-2 [a in length, which he regards as nuclei. In the fertile hyphee 
there are several of these bodies, often a large number ; in the spores 
only one ; they multiply by division. In Bhizopus nigricans they occur 
in the “ stolons.” In Pilubolus crystallinus the results were less decisive. 
The best staining reagent for these minute nuclei was found to be 
picronigrosin. 
Syncephalastrum elegans. t — M.E.Marchal describes this new species 
of Syncephalastrum (Mucorini) found on the bark of the stem of Cinchona 
rubra. It presents an interesting connecting link between the Mucoreae 
and the Synceplialidae, the structure of the mycele and the arrangement 
of the sporanges being those of typical Mucorese, while the form of 
the sporanges, linear and cylindrical, resembles that of Syncephalis. 
Cultivation of Rhizopus nigricans. J — M. E. De Wevre details the 
results of a long series of experiments on the culture of this fungus, 
describing the changes induced by cultivation in different media and 
by differences in the external conditions. The zygosperms are formed 
only under unfavourable conditions of growth, and the author draws 
from his experiments the conclusion that this fungus has lost the power 
of forming these organs except under special conditions, and that there 
are races of it in which this faculty is altogether suppressed. 
New Genera of Hyphomycetes.§ — Mr. A. P. Morgan describes the 
two following new genera of Mucedineae : — 
Cylindrocladium. Sterile liyphae creeping, branched ; fertile hyphae 
erect, forked or trichotomously branched, the sporophores in pairs or 
threes at the extremities of the branchlets and cymosely arranged ; 
spores solitary, cylindrical, 1-septate, hyaline. C. scoparium , on an old 
pod of Gleditschia triacantlios. 
Synthetospora. Hyphae procumbent, branched, intricate, sending out 
short lateral fertile branchlets, which produce the spores at the apex ; 
spores lobed, each consisting of a large opaque central cell with several 
smaller hyaline cells sunk partly into its surface. A compound 
Mycogone. S. electa , on the hymenial surface of a Peziza. 
Monograph of Dematophora. |] — According to M. P. Yiala, the 
disease of the vine and of other cultivated and wild plants known as 
pourridie , may be produced by a variety of fungi — Agaricus melleus , 
Dematophora necatrix , Vibrissea hypogea , and the mycele of Psathyrella 
ampelina. Of these, by far the most destructive is the Dematophora. 
Dematophora necatrix is a very polymorphic fungus, occurring in as 
many as six mycelial forms, viz. as a white external mycele ; as a 
* Bull. Soc. Bot. Belg , xxx. (1892) pp. 191-5 (1 pi.). 
t Bull. Soc. Beige Microscopie, xviii. (1892) pp. 124-32 (4 figs.). 
} Tom. cit., pp. 133-52. 
§ Bot. Gazette, xvii. (1892) pp. 190-2 (2 figs.). 
II ‘ Monographic du pourridie (Dematophora),’ Paris, 1891. See Bull. Soc. Bot. 
France, xxxix. (L892) Rev. Bibl., p. 9. 
