230 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
in most cases, in several species of each genus. The following is given 
as an analytic key to the characters of the genera : — 
Promycele external. 
Teleutospores pedicellate, independent. 
Teleutospores 1-celled 
,, 2-celled 
„ 3-celled 
„ 4-1 1-celled 
Teleutospores pedicellate, gelatinous. 
Teleutospores 2-celled 
Teleutospores sessile, united into a crust. 
Teleutospores 1-celled 
„ 4-celled 
Teleutospores sessile, confluent in a row 
Promycele internal (probasid) 
Pseudo-promycele 
In all these genera there is great uniformity in the structure of the 
nucleus and in its behaviour during division, and especially in the process 
already described under the name of pseudo-fecundation. 
Uromyces 
Puccinia 
Triphragmium 
PJiragmidium 
Gymnosporan gium 
Melampsora 
Thecopsora 
Cronartium 
Coleosporium 
EndopJiyllum 
Parasitic Fungi. — Herren M. Woronin and S. Nawaschin * * * § confirm 
their statement of the specific distinction of Sclerotinia heteroica and 
S. megalospora. The former produces sclerotcs on Ledum palustre, the 
latter on Vaccinium uliginosum, and not vice versa . 
Mr. G. Pirn j describes a new parasitic fungus, Bamularia Lapse, 
growing on the leaves of the rape. 
Under the name Schinzia scirpicola , Herr C. Correns J describes a new 
species parasitic on Scirpus paucijlorus, and distinguished by the sculp- 
ture of the spore-membrane. 
Prof. A. S. Hitchcock and Mr. J. B. S. Norton § give a detailed 
account of the life-history and parasitism of the common smut of Indian 
corn, Ustilago Zese Mays, together with a complete bibliography and 
synonymy. They state that infection takes place only through the 
conids, which germinate in soft growing tissues of the host. A descrip- 
tion is also given of the less common “head smut” of Indian corn, 
Ustilago Beiliana . 
Black-Rot of the Vine. — M. P. Viala || states that, of Guignardia 
Bidtvellii, the parasitic fungus which causes this decay, pycnids, spermo- 
gones, peritheces, conidiophores, sclerotes, and chlamydospores are 
known. The peritheces hibernate, as well as the sclerotes ; chlamydo- 
spores are formed only under abnormal conditions. The pycnids play 
the most important part in the reproduction of the fungus. 
M. A. Prunet f finds that the sclerotes may germinate in the autumn 
of the year in which they are formed, instead of in the following spring, 
* Zeitschr. f. Pflanzenkr., vi. (1896) pp. 199-207 (2 pis.). See Bot. Zt g., lv. 
<1897) 2 te Abt., p. 28. Cf. this Journal, 1895, p. 81. 
t Journ. Bot., xxxv. (1897) pp. 57-8. 
% Hedwigia, xxxvi. (1897) pp. 37-40 (1 fig.). 
§ Kansas State Agric. Coll. Bull. No. 62, 1896, 44 pp. and 12 pis. 
|1 Comptes Rendus, cxxiii. (1896) pp. 905-7. 
11 Op. cit., cxxiv. (1897) pp. 250-2. 4 
