530 SUMMARY OF CURRENT RESEARCHES RELATING TO 



a less complicated structure, the fertile hypkre arise directly from the 

 vegetative mycelium, and form a swollen head on which are seated the 

 septate brownish spores. Thaxter found two species of this genus. 

 These fungi are from tropical regions. 



Ravenelias of the United States and Mexico.* — William H. Long, 

 junr., groups the species in three genera. Ravenelia : All the teleuto- 

 spores in a head one-celled ; ascidia when present have a well-developed 

 pseudoperidium. Pleoravenelia : Inner teleutospores in a head two- 

 celled ; ascidia as in Ravenelia. Neoravenelia : Teleutospores one-celled ; 

 secidia without a pseudoperidium. The two latter genera have been 

 established by the writer, and have caused a rearranging of the species 

 already known. There are also a number of species new to science. 

 The genus is tropical or sub-tropical, and with two exceptions the species 

 grow on Leguminosre. They are distinguished by the glandular appear- 

 ance of the sori. Long describes the best method of examining and 

 preserving microscopic specimens. 



Notes on Uredinese.f — The first of these, by E. W. D. Holway, 

 comprises critical notes on Puccinia columbiensis, some confusion having 

 arisen in the determination of the host-plant, and on P. suffused, the 

 name now proposed for P. Pulsatilla Rostr. The writer gives a detailed 

 account of P. fusca, the Mcidium fuscum of Persoon. 



A new species, Melampsorella Feuricliii,% has been determined by 

 P. Magnus and named after G. Feurich, who collected it on a plant of 

 Aspleniwn septentrionah. The uredo- and teleutospore-forms have 

 both been observed. The writer gives a careful description of the 

 fungus and adds notes on other fern rusts, which also probably belong 

 to the genus Melampsorella. 



Fr. Bubak§ supplies! critical notes on Puccinia fusca and P. Pulsatilla} 

 There is also information given about P. compacta and P. Typhcc. 



H. and P. Sydow || publish -descriptions and notes of a considerable 

 number of species collected from many localities. Some of the American 

 species have been determined in conjunction with Holway. Two new 

 species of Ustilago are also described. 



The same writers^! give an account of the rusts found on Anemone 

 narcissiflora, three different species or possibly forms of the same species, 

 but distinguished by the size, form, and outer membrane of the spores. 



Cultures of Uredineae.** — J. C. Arthur publishes a third report of 

 successful work on the culture of plant-rusts. He bases his work chiefly 

 on field observation, and notes that in no case was success obtained where 

 definite clues derived from field observations as to the hosts were lacking. 

 He has succeeded in connecting the Puccinia and Mcidium forms of 

 seven species, of which the teleutospores grew on grasses or sedges. The 

 "writer gives a detailed account of the different experiments. 



* Bot. Gazette, xxxv. (1903) pp. 111-33 (2 pis.). 



t Journ. Mycol., viii. (1902) pp. 171-2. 



X Ber. Deutsch. Bot. Ges., x. (1903) pp. 609-12 (1 pi.). 



§ Hedwigia Beibl., xlii. (1903) pp. 28-32 (14 figs.). 



I| Ann. Mycol., i. (1903) pp. 15-23. 



1 Tom. cit., pp. 33-5. ** Bot. Gazette, xxxv. (1903) pp. 10-23. 



