584 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Juglandis ; Gnomonidla tubiformis with Leptothyrium alneum ; Myco- 

 sphcerella sentina with Septoria nig&rrima ; and Pseudopeziza Ribis sp. n. 

 with Glozosporium Ribis. Details are promised in a future communi- 

 cation. 



Some of his results are published * in a more recent paper on these 

 fungi, his object being to establish the relationships between the 

 different forms. He selected Glceosporium Ribis, which attacks the red 

 currant, for examination, and obtained good infection results by sowing 

 the spores on healthy leaves, and thus reproducing the Glceosporium. 

 During the winter he sought for the ascus form on the decaying 

 leaves. Among other forms of the fungus he found a Discomycete, 

 which he places as a new species in the genus Pseudopeziza. He gives a 

 detailed account of his various cultures and inoculations ; he succeeded 

 in reproducing the Glceosporium from the ascus spores of the Pseudopeziza. 

 He draws attention to the fact that one cannot determine what may be 

 the alternate form of any fungus without actual proof. In one case 

 Glceosporium alternates with a Pyrenomycete ; in this case the higher 

 fungus is a Discomycete. 



Notable -Pycnidial Type.f — Tycho Vestergren describes a new 

 species of Sphasropsidea?, Diplodina Rostrupii. He takes occasion to 

 discuss the different types of this family, Sphaeroidaceae, Excipulaceae, 

 and Leptostrornaceas, distinguished from each other by the formation of 

 the pycnidium. The species under discussion grew on the previous 

 year's capsules of two forms of Ericaceae, Phyllodoce and Andromeda, in 

 the higher regions of Lapland. Yestergren describes the growth and 

 appearance of mycelium, pycnidium, etc., the opening of the pycnidium, 

 the hymenium, conidiophores, and conidia. Pycnidia and conidia vary 

 in size to a great extent ; the larger pycnidium containing the larger 

 conidia, and different sized individuals occurring on the same capsule. 

 The author warns systematists against making the size of conidia a 

 specific character. 



Botrytis cinerea. — Much damage is caused each year to grapes by 

 this fungus, and J. M. Guillon J reports the results of some inoculation 

 experiments he instituted to find out the mode of attack by the Botrytis. 

 He sowed spores on grapes that had been pricked, and in each case the 

 rotting of the fruit followed. Results were not so quick nor so universal 

 with undamaged grapes, but a very large percentage of these also were 

 infected. The resistance offered by the pellicle to the penetration of 

 the hyphas was complete only in some cases. 



Rhacodium cellared — F. Gueguen has published a morphological 

 and biological study of this cave fungus. He traces its appearance 

 in literature from the " Byssus tenerrima, nigra, doliolaris " of Ray (in 

 1690) down to Schroter's account of it in 1893. In wine growing 

 countries it is considered to be harmful to the wines, as along with 

 Penicillium and Dematium, it gives the objectionable cork odour. The 

 various specimens examined differed slightly in colour and form, but 



* Zeitschr. Pflanzenkr., xvi. (1906) pp. 65-83 (2 pis.). 



t Arkiv Bot. v. (1906) No. 11, 14 pp. (2 pis.). 



J Comptes Reudus, cxlii. (1906) pp. 1346-9. 



§ Bull. Soc. Mycol. France, xxii. (1906) pp. 77-95, 146-63 (3 pis.). 



