748 SUMMARY OF CURRENT RESEARCHES RELATING TO 



species, and were frequently found on Mahonia plants. The recidio- 

 s] tores retain their germinating capacity three weeks or a month, but 

 they are killed by sudden drying. The spores form a germinating tube 

 which travels towards the nearest stoma, and enters the tissue of the 

 plant, where it branches and forms a felt of mycelium. The author 

 further describes the occurrence and germination of uredospores and 

 teleutospores, and combats Eriksson's mycoplasma theory. He con- 

 siders that the disease may be very well accounted for by the 

 teleutospores alone, and only climatic conditions prevent the wintering 

 of uredospores. He further tested Eriksson's theory by growing seeds 

 of rusted corn after treatment with formalin : the seedling aud mature 

 plant were equally free from rust. Finally, the specialization of rust on. 

 different grasses is discussed. 



Two new species* of the genus Phakospora are published by 

 P. Dietel. They were sent to him from India by E. J. Butler. The 

 uredo-form of one of them had already been described from Japan ; the 

 other, P. PhylJanthi on Phyllanthus distichus is entirely new, and 

 both uredospores and teleutospores were found. 



J. C. Arthurf reports on the cultures of Uredinese carried out 

 during the year 1909 by himself and other associated workers. Excursions 

 were made for culture material to South Carolina, St. Louis, and Leland 

 in Michigan. The records include fourteen cultures that gave negative 

 results, twenty-three with positive results on plants that had already 

 been experimented with, and four cultures of new material, including 

 three new species. The successful cultures were : — Puccinia Ceanothi, 

 with teleutospores on Andropogon Hallii ; Gymnosporangium exiguum 

 sp. n. on Crataegus Pri/iglei, the teleutospores on Juniper us virginiana; 

 Gymnosporangium cornicularis sp. n. on Amelanchier erecta and A. cana- 

 densis, the teleutospores on Juniperis horizontalis ; Gymnosporangium 

 trachysorum sp. n. on Crataegus punctata, C. coccinea, C. cerronis, with 

 teleutospores on Juniperus virginiana. 



New Genus of Uredinacese.l — E. J. Butler describes this rust, 

 Cgstopsora Olese g. etsp. n., which occurs as little white dots on orange 

 spots of the leaves of Olea dioica in Bombay. In the teleutospore stage 

 a strand of hyphas passes out of the infected leaf through a stoma ; 

 they then form large irregular basal cells from which arise the teleuto- 

 spores, one-celled and spherical. An JEcidium was found on some of 

 the specimens almost wholly sunken in the leaf, then opening by a stellate 

 or roundish orifice ; no spermogonia were observed, and no uredospores. 



Wood-destroying Fungi. § — Konstantin Ilkewitsch has published a 

 long criticism of Falck's researches on this subject, insisting that many 

 mistakes have been made. He divides the errors he has noted into three 

 categories : (1) Errors in observation; (2) in method ; and (3) in the 

 presentation of facts and in the theories drawn therefrom. A long list 

 of errors is set out under these different headings, and then the writer 

 proceeds to support his contentions. His adverse criticism practically 

 embraces the whole of Falck's results. 



* Ann. Mycol., viii. (1910) p. 4G9. t Mycologia, ii. (1910) pp. 213-40. 



\ Ann. Mycol., viii. (1910) pp. 444-8 (1 pi.). 

 § Bot. Zeit., xi. (1910) pp. 101-23. 



