S& SUMMARY OF CURRENT RESEARCHES RELATING TO 



germination. The germinating pores of many uredospores are protected 

 by stoppers of this kind. This absorption of water is most strongly 

 displayed in spores of Gymnosporangmm ; also in some species of 

 Puccinia and Uromyces, especially in the Brazilian U. giganteus. 



Rabenhorst's Cryptogamic Flora of Germany, &c. (Fungi Imper- 

 fecti). — Parts 78-81 by A. Allescber, are now published. The genus 

 Hendersonia is completed with 163 (besides 11 doubtful) species, fol- 

 lowed by Couturea (1), Wojnoicicia (1), Angiopoma (1), Cryptostictis (8), 

 Eriosporina (1), Prosthemium (3), and Hendersonula (1 sp.). The eighth 

 section of this division, the Dictyosporae, has rusty or olive-coloured 

 ovate or elongated spores with two or more septa. It comprises the 

 genera Camarosporium (92), Cytosporium (2), and Dicliomera (10 sp.). 



The second family, the Nectrioideae, are characterised by having the 

 receptacle and stroma, when present, somewhat fleshy and waxy, light- 

 coloured (whitish, yellow, red, or orange), spherical, or less often two- 

 lobed or bowl-shaped. They are divided, according to the colour or 

 septation of the spores, into Hyalosporae, Didymosporaa, Hyalophragmia?, 

 and Scolecosporae. Tho HyalosporsB have spherical, ovate, or elongated 

 spores, which are unicellular and hyaline. The genera are Zythia with 

 10, Libertiella with 1, Boumegueriella with 1, Pleosporopsis with 1 T 

 Chsetozythia with 1, Collacyslis with l,and Sphseronsemella with 9 species. 

 The Didymosporae, comprising the single monotypic genus Pseudo- 

 diplodia, have slightly olive-coloured uniseptate spores. The Hyalo- 

 phragmiae havo hyaline spores with two or more septa, and comprise the 

 genera Stagonopsis (3), Pseudostictis (2), and Chiatospora (1 sp.). In 

 the Scolecosporae, the spores are filiform or rod-shaped ; they comprise 

 the monotypic genera Trichocrea, Bhynchomyccs, and Polystigmina. 



The third family, the Leptostromaccae, have a membranous or car- 

 bonaceous receptacle, which is more or less distinctly bisected. A 

 similar classification is made into Hyalosporas, Phaeosporae, Hyalo- 

 didymae, Phaaodidymae, Hyalophragmiae, Phseophragmise, and Scoleco- 

 sporas. In the Hyalosporae are comprised LeptotJiyrium with 68 species, 

 Piggotia with 5, Actinothccium with 1, Leptostroma with 45, Labrella 

 with 10, Socidium with 14, Melasmia with 2, and Triclioplila with 

 1 species. The Phaeosporae include only a single genus, Pirostoma r 

 with 3 species ; the Hyalodidymae also a single monotypic genus Lepto- 

 thyrella ; and the PhaeodidymaB a single monotypic genus Diplopeltis. 

 The Hyalophragmiae are made up of two genera, Discosia (5 species), 

 and Entomosporium, of which two species are described. 



Parasitic Fuugi. — On the leaves of a grass, Cynosarus elegans, from 

 Tunis, P. Hennings * finds an undescribed species of Uromyces, which 

 he names TJ. pJiyllaclwr aides sp. n. 



As the result of an examination of the infection of species and 

 varieties of Bromus by Puccinia dispersa, Prof. H. Marshall Ward f 

 concludes that the uredospores infect most easily the species and variety 

 on which they have been developed, less easily species or varieties 

 more remote, and fail altogether to gain a hold on more distant ones. 

 The acts of infection and incubation occupy about 10 days. The lack 



• Hedwigia, xl. (1901) Beibl., pp. 129-30. 

 t Ann. Bot., xv. (1901) pp. 5G0-2. 



