78 SUMMARY OF CURRENT RESEARCHES RELATING TO 



" white rot." This is caused by the fungus Coniothyrium diplodiella, 

 which most frequently attacks the fruit and destroys every grape on the 

 bunch. Occasionally it spreads to the branches, causing pale-coloured 

 patches. The best remedy is to burn all diseased parts of the plant, and 

 to spray at intervals with permanganate of potash. 



Endophytes of Orchideae.* — B. Noel has isolated the fungus from 

 the roots of several orchids, the presence or absence of which determines 

 the ripening of the seeds. The writer was able to distinguish the 

 different fungi from each other. The one on Phalcenopsis for instance 

 was able to form sclerotia, and is compared with Rhizoctonia Solani. 



Case of Symbiosis.f — Franz Zach found a fungus growing sym- 

 biotically with an Erineum on lime leaves, due to a gall mite. The 

 gametes, copulation, and swarm-spores of the fungus were observed, but 

 the systematic position is still uncertain. Presumably the mite, by 

 irritation of the host plant, induces a suitable substratum for the fungus, 

 and the fungus pierces an opening through the cell wall by which the 

 mite is enabled to pass through and reach further food supplies. 



Mycological Notes.f — Fr. Cavara takes exception to A. P.Morgan's 

 criticism of his genus Gibellula, even while adding a new species to it. 

 He thinks Morgan has misunderstood his diagnosis, and that the species 

 Gibellula capellaris Morgan cannot be considered as belonging to the 

 genus. Cavara also draws attention to Claussen's work on Boudiera. 

 He lays great stress on the cytological value of the paper, but suggests 

 that Claussen has made a mistake in the determination of the fungus on 

 which his observations were made. Cavara considers it to be a species 

 already described by Van Tieghem as Ascodesmis nigricans. The writer 

 gives full reasons to justify his criticisms. 



Guide to Fungolog-y. — Edm. Michael § has just issued the third 

 volume of a work dealing with the principal larger fungi, edible and 

 poisonous. He describes the common forms of fields and woods, and 

 also describes a few rare plants, such as Clathrus cancellatus. The chief 

 characteristics of the fungi are pointed out, and the 131 drawings are 

 arranged on 10 plates for use in schools. 



B. Studer-Steinhaiislin || has drawn and described the most important 

 edible fungi of Switzerland. Attention is also directed to poisonous 

 forms that might be mistaken for the others. 



American Mycology. — A. P. Morgan f publishes a new species of 

 Kalmusia and a note on Peziza pubida, the synonymy of which is doubt- 

 ful as the various spore measurements of species show great divergences. 



J. J. Davis ** has found anew species of Synchytrium on the leaves 

 of Scirpus. It produces little distortion of the host. 



* Comptes Rendus, cxl. (1905) p. 1272. See also Ann. Mycol., iii. (1905) p. 383). 

 f Jahresb. k. k. Franz. -Josefs- Staatsgymn. Saaz (1905) p. 1-5 (2 pis.). See 

 also Bot. Centralbl. xcix. (1905) pp. 407-8. 

 % Ann. Mycol. iii. (1905) pp. 362-5. 

 § Zwickau. Sax. (Forster and Borries) 1905. 



I Die Wicht. Speisepilze der Schweiz. 3 Aufl. (Berne, 1905) 24 pp. (12 col. pis.). 

 % Journ. Mycol., xi. (1905) pp. 153-4. ** Tom. cit., pp. 154-6 (2 figs.). 



