ZOOLOGY AND BOTANY, MICKOSCOPYj ETC. 1007 



Polyporese.* — M. J. de Seynes traces tte complete life-history of 

 two species belonging to this family : — Polyporus sulfureus and biennis. 



In P. sulfureus the thickenings in the cell-walls are often coloured 

 blue by iodine. The reproductive bodies are of two types, spores and 

 conidia. The spores are usually developed on basidia. The conidia 

 may be formed either on the mycelium, or in the interior of the sporiferous 

 receptacle, or in the receptacles which produce nothing but conidia, 

 which resemble a Myxomycete, and have been described under the name 

 Ptychogaster aurantiacus. The mycelial conidia are produced in the 

 interior of the woody tissue of the tree on which the Polyporus grows. 



P. biennis may occur in the condition of Fibrillaria or of Ceriomyces ; 

 the former being a kind of rhizomorph ; the latter consisting of rounded 

 tubercles or stalked cones. The basidia are replaced by branching 

 conidiophores which may produce larger or smaller conidia. 



Prototremella.t — M. N. Patouillard characterizes this new genus of 

 heterobasidious Hymenomycetes as follows : — Prototremella nov. gen. 

 A heterobasidious Hymenomycete with an exposed, sub-gelatinous 

 receptacle, the simple basidia carrying four large sterigmata ; spores and 

 conidia globular. 



This fungus is met with on the sallow and poplar, and has been 

 named Prototremella Tulasnei by the author; two other species are 

 indicated, which possibly belong to this genus : Gorticium uvidum Fr., 

 and Exidiopsis effusa Brefeld. 



Aseospora Beijerinckii4— M. P. Vuillemin describes Ascospora 

 BeijerincMi, a parasite which attacks cherry trees. On the black spots 

 which may be seen on the surface of the fruit, various adaptations of the 

 mycelium for its latent life will be found. The violet-brown filaments 

 with thick walls frequently take a moniliform aspect. Stylospores and 

 pycnidia are also formed. The perithecia are black, depressed, spherical 

 in shape, and with either a very small opening or none at all. At first 

 the ripe asci are ovoid, being attached by the larger extremity ; they 

 inclose eight spores. 



Uredinese and their Hosts.§ — Herr P. Dietel has here classified all 

 the known species of Uredinese, 980 in number, according to their host 

 plants, which belong to 122 different families. The greatest amount of 

 heteroecism is displayed by the parasites of the Compositas and the 

 Graminete. Among Eosaceae, true species of Phragmidium occur only on 

 the Eoseee, Potentillege, Eubese, and Poteriese, while the Gymnosporangia 

 are confined to the Pomese. The 12 species of the exotic genus 

 Bavenelia are confined to the Leguminosee, the species of Hemileia to the 

 Eubiaceee, and Pileolaria to the Anacardiacese. On 120 species of 

 Compositfe there are known, as parasites, 25 secidia, 9 Uromyces, about 

 20 Puccinise, 1 Cronartium, 1 Melampsora, and 3 Coleosporise. 



Structure and Life-history of Puccinia Graminis.]]— Prof. H. 

 Marshall Ward describes in this paper a portion of a series of illustra- 

 tions of life-histories of parasitic fungi, which he has made for the 



* ' Kech. pour servir a I'hist. nat. des vegetaux infeiieurs,' pt. ii. Polypores, 66 pp. 

 and 6 pis. See Bull. Soc. Bot. France, xxxv. (1888) Eev. Bibl, p. lU. 



t Moral's Journ. de Bot., ii. (1888) pp. 267-70. + Ibid., pp. 255-9. 



§ 'Verzeichn. sammtlicher Uredineen, nach Familien ihrer Nahrpflanzen 

 geordnet,' 58 pp., 1888. See Bot. Centralbl., xxxv. (1888) p. 187. Cf. this Journal, 

 ante, p. 97. || Ann. of Bot., ii. (1888) pp. 217-22 (2 pld.). 



3 Y 2 



