•)44 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the conidial stas^e, but also the ascigerous stage which he has discovered, 

 and which he places among the Discomycetes as Diplocarpon Rosse 

 g. et sp. n. The apothecia of the ascigerous stage are very small and dark 

 brown in colour ; the spores are one-septate and colourless. Wolf states 

 that the disease occurs in America on nearly all the cultivated varieties 

 of roses, and that the amount of loss caused is equalled or surpassed hj 

 only one other rose disease, the powdery mildew. 



Plant Diseases.— N. E. Stevens* describes the damage done by the 

 fungus Polystictus versicolor to Catalpa trees, on which it is a wound- 

 parasite. He notes particularly the presence of tyloses in the vessels of 

 the diseased trees. The fungus grew abundantly on rotten stumps, and 

 Stevens thinks that these stumps were infected before the trees were cut. 



Ali Eizaj found that the leaves of a Pelargonium were disfigured by 

 yellowish spots, on which grew the perithecia of Coniothyriimi Trahuti 

 sp. n. Riza noted that the spores were produced on basidia developed 

 only at the base of the perithecium. 



A disease of Sophora ja/ponica is described by M. Turconi and 

 L. Maffei.l The leaves of plants in the botanical gardens at Pavia 

 were disfigured by somewhat circular spots, which were dotted over with 

 the fructifications of a Macrosporium Sophorse, sp. n. In addition they 

 found on the liranches the sporodochia of a Fusariiim with curved 

 hyaline spores, the region of attack extending sometimes over the whole 

 branch. In winter the perfect fruiting form Giberella Briosianci sp. n. 

 was found on the diseased branches. The fungi are all carefully 

 described. 



A. W. Drost§ writes on the Panama disease of the Gros Michel 

 banana. He considers that the fungus, a species of Leptospora, a 

 Pyrenomycete, was in the country previous to the introduction of the 

 banana. The chief point of attack is the vascular system, where the 

 main stem gives off its branches, a little below the surface of the soil. 

 Besides perithecia, the fungus produces spores of the Oephalosporium and 

 Fusarium types. The fungus attacks various forms of banana, and can 

 live in the soil. 



S. D'Ayala j] reports on the ravages caused by Sclerotinia Lihertiana 

 on beans in Calabria. It is noted that there is more resistance to the 

 disease when phosphates are used for manuring, and that late plants 

 suffer less in comparison with those grown earlier. 



C. Maublaneli" has made a study of tlie various fungal diseases that 

 attack Vanilla in various parts of the world, on leaves mostly, but also 

 on the stalks and the pods. The fungi recorded are-. — Uredo Scabies, 

 Uromyces Joffrini, Sueratia coffeicola, S. Vanillse, Fusicladium VaniUae, 

 Phyllosticta Vanillse, Amerosporium Vanillae, and Ocellaria Vanillse. But 



* Mycologia,, iv. (1912) pp. 263-70 (2 pis.). 



t Mycologia, iv. (1912) pp. 148-50 (2 tigs.J. 



X Atti R. Acad. Linoei, cccix. (1912) pp. 246-9. 



§ Dept. Laudb. Suriname Bull., No. 26 (1912) pp. 1-41 (11 pis.). See also 

 Bull. Bur. Agric. Intell. Rome (1912) p. 3453. 



II L'ltalia Agric, xlix., No. 9 (1912) pp. 205-6. See also BuU. Bur. Agric. 

 Intell. Rome (1912) pp. 1678-80. 



^ L' Agric. Pays Ghauds, xii., No. 108, pp. 177-88, etc. (figs.). See also Bull. 

 Bur. Agric. lutell. Rome (1912) pp. 1630-1. 



