356 SUMMARY OE CURRENT RESEARCHES RELATING TO 



Polystictus of the perennis group and an account of Polyporus 



Schweinitzii, and again a note on Fomes nigricans, with photographic 

 reproductions of the two forms in question. There are many figures 

 throughout these works, of which the numbers are continuous with 

 previous issues, though a new pagination of the test begins with the 

 Polyporoid issue. 



Mycological Fragments : iii.* — Franz von Hohnel continues his 

 work on systematic mycology, passing under review many published 

 forms, and examining new material. In these notes he publishes four 

 new genera : Protodontia (Treruellacese) ; Wettsteinina (Dothiseacege), 

 with a single 8-spored ascus, which he places in a new family, Pseudo- 

 sphaeriaceaB ; Pseudospharia, also with one ascus, but with muriform 

 spores ; and SphmrodermeUa. He describes a large number of new species 

 from the neighbourhood of Vienna, and a second series from Samoa. 

 He gives also critical notes of various known forms : Bombardia fasci- 

 culata is placed by him among the Sordarieas, and these he divides into 

 two groups, according to the thickness of the perithecial wall. Dcpdalia 

 quercina he has decided must be included in Lenzites quercina, the 

 former name having been given to a less developed form. 



Diseases of Plants. — Attention is called f to Gooseberry Black- 

 Knot, a fungus that attacks the stems and larger branches of the 

 gooseberry and red and black currant. The first indication of the 

 disease is the wilting and yellowing of the leaves, which fall early in 

 the season. The fungus Plowrightia ribesia is a wound parasite, and 

 cannot pierce an uninjured surface. 



D. V. Hegyi $ describes cases of crumpling and distortion in wheat, 

 caused sometimes by an insect, and sometimes by the fungus Helmintho- 

 sporium gramineum, or by unfavourable weather conditions. 



Claude W. Egertou § has investigated an anthracnose of the black- 

 berry Rubus nigrobaceus, and found that it was due to a pyrenomycete, 

 Gnomonia Rubi. He cultivated the ascospores on bean agar, and 

 reproduced the perithecia in about ten to fourteen days. He also carried 

 out inoculation experiments with success, the fungus spread rapidly in 

 branches infected, and though blackberry fruit set, most of it dried up 

 before it matured. 



P. Yoglino || has given an account of a troublesome fungus on 

 Solatium Melongena. Brown spots of varying size are formed on the 

 leaves, later on the fruits, very rarely on the stems. Small perithecia of 

 Ascochgta hortorum appear scattered over the spots, and spores are 

 produced in great numbers. Favoured by the excessive humidity of a 

 wet season, these germinated on other leaves and penetrated to the 

 interior tissues through the pores of the stomata, and the brown spots 

 were again formed. Vogliano found that several other plants were 



* SB. k. Akad. Wiss. Wien, Math.-Nat. Kl., cxvi. 1 (1907) pp. 83-162 (1 pi.) 

 See also Hedwigia, Beibl., xlvii. (1908) pp. 117-22. 

 t Journ. Board Agric, 1908, pp. 680-1 (4 figs.). 

 J Zeitschr. Pflanzenkr., xvii. (1907) pp. 334-6. 

 § Bull. Torrey Bot. Club, xxxiv. (1907) pp. 593-7 (3 figs.). 

 || Malpighia, xxi. (1907) pp. 353-63 (1 pi.). 



