100 SUMMARY OF COREENT RESEARCHES RELATING TO 



but with only a single oosperm whicli entirely fills up the oogone. 

 (2) Pythiopsis ; gonids with two terpoiinal cilia, escaping separately from 

 the mouth of the sporange, and moving about with a swarming motion, 

 then coming to rest and germinating without becoming invested with 

 cellulose or a second period of swarming ; zoosporanges terminal on the 

 branches of the primary filaments, in rows, or with a cymose arrangement, 

 never proliferous after emptying; oogones and oosperms as in Sapro- 

 legnia. (3) Aplanes, resembling Achlya, but the gonids not swarming. 

 (4) Leptomitus {Apodya Corn.) ; thallus divided into compartments by 

 strictures without any actual septum, each containing a single nucleus ; 

 zoosporanges terminal, often several, one behind another, not proliferous ; 

 zoospores with terminal cilia, germinating directly, without a second 

 period of swarming ; sexual organs unknown. The following new 

 species are also described : — Saprolegnia monilifera, Leptolegnia caudata, 

 Pythiopsis cymosa, Achlya apiculata, A. oligacantha. 



Structure of White Rot.*— MM. G. Foex and L. Eavaz state that 

 a transverse section of the portion of a plant attacked by " white rot " 

 reveals the presence of the mycele of Coniothyrium diplodiella. The 

 filaments which compose it have a uniform structure. The spores arise 

 on the stigmata, to the summit of which they remain fixed until they 

 have finished growing, when they detach themselves from their support. 

 They are generally ovoid in form ; and if they are placed in a drop of 

 water they germinate in a few hours at a temperature of 18° to 20°. 

 As for the remedies to apply for " white rot," it has been found that 

 the salts of copper are the most efficacious. 



Cancer of the Cinchona, j — Herr 0. Warburg describes two kinds of 

 cancer which attack the cinchona-plantations of Java : one on the root, 

 the other on the stem. The former closely corresponds to the disease 

 produced by Agaricus melleus, and appears to be due to a fungus pro- 

 pagated by an underground rhizomorph rather than by spores. The 

 latter is caused by a different fungus, propagated by its spores, and is 



not unlike the cancer of the larch. 



• 



New Fungi of the Vine. J — Dr. F. Cavara enumerates the following 

 new species of fungus as attacking the vine : — Physalospora haccse, Glceo- 

 sporium Physalospora, Pestalozzia viticola, Napicladium pusillum, Alter- 

 naria vitis, and Tuhercularia acinorum. The author gives the following 

 diagnosis of the new genus Briosia : — Stroma verticale, cylindraceum, 

 stipitatum, hyphis fasciculatis compositum, apice capitulum compactum 

 efformans; conidia globosa, tipice catenulata, fusca, acrogena. 



Diseases of the Vine.§ — MM. P. Viala and L. Eavaz state that the 

 disease known as melanose, which is caused by the parasite Septoria 

 ampelina B. & C, originally came from America. Melanose appears 

 only to attack the leaves of the vine, and has not as yet been observed 

 either on the branches or on the fruit. Small circular brown spots, 

 which are equally apparent on both surfaces of the leaf, are the first 

 indications of this disease ; these grow rapidly and change in colour to a 

 deep brown or sometimes even black. The mycele of this fungus, which 



* Kev. Mycol., x. (1888) pp. 201-3. 



t SB. Gesell. Bot. Hamburg, iii. (1887) pp. 62-72. See Bot. Centralbl., xxxvi. 

 (1888) p. 145. 



X Rev. Mycol., x. (1888) pp. 207-8. § Ibid., pp. 193-9. 



