5 Ll I SUMMARY OF CURRENT RESEARCHES RELATING TO 



open on solid substrata, as well as in solutions where there is lack of 

 nutrition. 4. Mycelium, taken from a culture solution and placed in a 

 damp chamber, forms pycnidia. 5. Layer and single spores are formed 

 in culture solutions of maltose, cane-sugar, etc. 6. The fungus will 

 grow in 10 p.c. citric and tartaric acid solutions, but the development is 

 abnormal. The author calls for a revision of the fungi imperfecti on 

 physiological lines. 



Genus Phomopsis.* — H. Diedicke has studied V. Hohnel's genus 

 Phomopsis, under which were grouped certain well-marked forms of the 

 genus Phoma. He finds a large number of species with the same 

 characteristics : perithecia with a sclerotic wall seated on a broad basis, 

 colourless below and dark above, with thread-like or awl-shaped sporo- 

 phores and narrow fusiform spores. He lists 107 species for Germany, 

 previously included under Phoma, and probably all of them pyenidial 

 forms of Diaporthe. 



Gloeosporium Ribis.f — Ed. Janczewski and B. Xamyslowski found 

 a species of Gloeosporium on the leaves of Ribes luteum in the Botanic 

 Gardens at Cracovia. The fungus was also found on another species 

 of Ribes in the sub-genus Parilla. The pustules formed ou the leaves 

 produced either macroconidia or microconidia, the latter extremely 

 minute. Germination of the macroconidia took place easily in nutrient 

 solutions, and secondary macroconidia or microconidia were formed. 

 Inoculation experiments were tried without success. 



Studies in North American Hyphomycetes.t — D. R. Sumstine has 

 made a study of numerous species of Rhinotrichum, a colourless Hypho- 

 mycete closely related to Botrytis and to Sporotrichum, but differentiated 

 from the latter by the upright habit of the fertile branches. The author 

 re-describes the species from the different American collections, and gives 

 diagnoses of two new forms. He also gives an account of Olpitrichum, 

 a genus with, so far, two species in America. 



Tilletia horrida in Rice-meal. § — P. Filter states that for many 

 years the large echinulate spores of some smut had been recognized 

 in rice-meal ; he has been able finally to determine it as Tilletia horrida, 

 first discovered as a parasite of rice-plants in Japan, and described by 

 Takahashi. It was at a later date discovered in the United States. It 

 has now been found in India over a large territory. Germination of the 

 spores was attempted and failed. 



Uredinese. — V. Tubeuf || discusses the question of the absence of 

 uredospores on pine-needles. He suggests that it is because the needles 

 are infected by the sporidia of the teleutospores, which produce the 

 JEcidial or Cseoma generation. Infection does not take place through 

 the stomata, but on the young and tender needles through the cuticle, 



* Ann. Mycol., ix. (1911) pp. 1-35 (3 pis.). 

 t Bull. Int. Acad. Sci. Cracovie, 1910 (19H) pp. 791-5 (3 figs.) 

 % Mycologia, iii. (1911) pp. 45-56 (2 pis.). 

 § Centralbl. Bakt., xxix. (1911) pp. 342-6 (4 figs.). 



|| Nat. Zeitschr. Forst.-Landwirtsch, vii. (1910). See also Centralbl. Bakt., 

 xxix. (1911) pp 88-9. 



