426 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Phycomycetes from Nova Scotia.* — C. L. Moore gives a general 

 account of the group of aquatic fungi, and describes the species that 

 have been recorded in Nova Scotia! They were collected in various 

 localities mainly hj himself, and often from cultures of material taken 

 from various pools. The reproductive organs are generally figured as 

 well as described. 



Synchytrium pyriforme.f — This fungus was discovered on the leaves 

 of a moss by Renisch in 1875. It was rediscovered recently in Switzer- 

 land, and has been studied and described by Gertrud Tobler-Wolff . It 

 forms small pyriform projections on the surface of the moss-leaf ; it is 

 easily knocked off, and is often found free from the host. Cultures were 

 made, and the development of the fungus followed. 



Revision of the genus Dimerosporium.J — F. Theissen has given a 

 descriptive account of all the species. He begins by rejecting sixty-one 

 species as imperfect, or as belonging to other genera. The genuine 

 species of IHmerosporium are divided among five genera, that differ from 

 each other in the characters of peritliecia and spores. The new genera 

 proposed by Theissen are : — Dimerina, Fhseodimeridla, and Acant ho stoma. 



Microsphsera on Oak. — E. Griffon and A. Maublanc§ describe 

 several American species of Microsphaera, and also some European 

 species. Until a year ago only two authentic species had been recorded 

 from our own continent. Lately, M. Arnaud has discovered the peri- 

 thecia of the new oak disease, and has concluded that the fungus is 

 identical with Microsphsera quercina ; but the above authors consider it a 

 new species, M. alphitoides. Many notes are given of the different species. 



G. Arnaud and E. Foix || publish a statement of their discovery that 

 the oak mildew is M. quercina, well known on American oaks. The 

 perithecia had already been several times found in Europe, but not in 

 good condition, or they were not sufficiently examined and described. 



G. Trincheri 1 comments on the above discovery, and suggests that, 

 before the matter can be considered absolutely decided, it would be 

 advisable to compare not only the perithecia but the conidial stages of M. 

 quercina, as known in America, with the mildew on oak leaves in Europe. 



Oidiopsis taurica. — This fungus is usually endophytic, but Etienne 

 Foix ** describes cases he has noted in which a superficial mycelium is 

 also produced, and on the mycelium a second form of conidiophore very 

 much smaller than the normal one, and with smaller spores. He com- 

 pares the genus with other Erysiphacese. 



Experiments vfiih. Pov/dery Mildew of Wheat.tt — G. M. Reed 

 has already published results of infection experiments with Erysiphe 

 graminis. He continues the work in the present paper. The results 



* Proc. and Trans. Nova Scotia lust. Sci., xii. (1912) pp. 217-38 (24 figs.). 



+ Ber. Deutsch. Bot. Gesell., xxs. (1912) pp. 146-50 (] pL). 



X Beih. Bot. CentralbL, sxix. (1912) pp. 45-73. 



§ Bull. Soc. Mycol. France, xxviii. (1912) pp. 88-104 (8 pis.). 



II Comptes Rendus, cliv. (1912) pp. 1302-5. 



t Bull. Soc. Bot. Ital. (1912) pp. 100-2. 

 ♦* Comptes Reudus, cliv. (1912) pp. 225-6. 

 tt Phytopathology, ii. (1912) pp. 81-7. 



