ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 77 



The Gonatorrhodeae with the one genus Gonatorrhodum is described and 

 several genera of the Haplographie^e. In the succeeding fascicle he 

 carries on the descriptions down to the suborder Chalarete, which in- 

 cludes genera that bear simple chains of conidia. He has already 

 described 1473 species of Hyphomycetes. 



Uredinese. — Ed. Fischer* gives the details of a series of experiments 

 with various heteroecious Uredinete. He finds that Uromyces graminis, 

 which forms its secidia on Laserpitium Siler, is not identical with the 

 one that has Seseli glaucum as its alternate host. He gives some of 

 his experiences with the germination of the teleutospores. Following 

 Eriksson's advice as to cooling the spores, he soaked the leaves with the 

 teleutospores in water, and the second night after he had a plentiful 

 formation of basidia and sporidia. Infection experiments were also 

 carried out with the teleutospores of Pnccinin liliacearum on Or/iitho- 

 (jalum. Fischer found considerable variability when it was grown on 

 different hosts. 



Walter Krieg f has worked with the a3cidia of various species of 

 Ranunculus and their Puccinia-forms on different GramineEe. Results 

 are given. 



Wilhelm Miiller % lias been experimenting with the Melampsorte on 

 Euphorbia and Hypericum. Most of the species are autoecious, but tlie 

 Uredo hosts of 2Ecidium Eupliorhicc-gerardiaace, belong to the genus 

 Ononis. Melampsora hyper icorum, which was said to grow on eleven 

 species of Hypericum, is so far specialised that the form on H. montanum 

 would grow on no other host, and must be designated Mel. Hyperici- 

 montani. 



A long series of researches on the specialisation of Puccinia on 

 Labiatfe is published by Paul Cruchet.§ He gives the lists of plants on 

 which he made the inoculation experiments. The first part, including 

 eleven series of infections, is devoted to P. MenthcB. 



L. Hecke |1 has attempted, by means of inoculation experiments, to 

 explain the presence of Puccinia Maydis, the I'ust of maize, which is 

 found wherever maize is cultivated. Arthur had established the hete- 

 roecious nature of this rust, its fficidium growing on Oxalis, though it 

 is rare, even in America, to find this stage of the fungus. Only once 

 has an ^cidium been recorded in Europe on 0. corniculata. Hecke 

 inoculated plants of various species of Oxalis with the teleutospores of 

 P. Maydis with varying results : 0. stricta was most readily and con- 

 stantly infected ; with 0. tropcBoloides infection was slower and not so 

 abundant ; on 0. rosea spermogonia alone were produced ; while only 

 spots without any fruit formation resulted from inoculation of 0. valdi- 

 viana. The secidiospores from 0. stricta were employed to reinfect the 

 maize, with immediate successful production of the uredospores. All 

 attempts to inoculate maize with its own teleutospores failed. The 

 author then discusses the theories as to the origin of the disease. The 

 ^cidium stage is of too rare occurrence to account for the universal 

 appearance of the rust. Experiment has proved that the teleutospores 



* Centralbl. Bakt., xvi. (1906) pp. 203-8. t Tom. cit., pp. 208-9. 



X Tom. cit., pp. 210-211. § Tom cit., pp. 212-24. 



II Ann. MvcoL, v. (1906) pp. 418-20. 



