Cryptogamen im Allgemeinen. — Eumycetes. 391 



Flora italica Cryptogamica edita curante Societate Bota- 

 nica Italica. (Firenze, 1912.) 



Le sixieme fascicule de cet ouvrage vient de paraitre. II com- 

 plete la partie consacree aux Lichens elaboree par A. Jatta, l'auteur 

 du „Sylloge Lichenorum Italicorum". Cette partie comprend 958 pp. 

 et la description en latin de 1533 especes avec clefs analytiques, 

 indications bibliographiques, habitats, etc. Les caracteres de chaque 

 genre sont illustres par des figures. De la Flore cryptogamique ita- 

 lienne ont paru dejä: Fungi (Pyrenomycetes, Hyphales, Gasterales 

 et Uredinales) avec 1347 especes; Algae (Florideae) avec 343 especes. 



A. Fiori. 



Barret, J. T., Development and Sexuality ofsome Spe- 

 cies of Olpidiopsis (Cornu) Fischer. (Ann. Bot. XXVI. p. 209— 

 238. Jan. 1912.) 



The author studied the life-history and cytology of three species 

 of Olpidiopsis, namely O. saprolegniae, Cornu, O. vexans, sp. nov. 

 (= O. saprolegnae, A. Fischer), and 0. luxurians, sp. nov. 



The zoospores of all three species are alike, and show two 

 motile periods separated by a period of rest. Each zoospore main- 

 tains its individuality after infection of the host h}'pha, and produces 

 one sporangium. 



The sexual organs, oogonia and antheridia, are regarded as 

 the morphological equivalents of the sporangia. They are produced 

 easily when the growth of the host is retarded, and the amount of 

 nourishment is limited, — and their formation is not necessarilj- 

 preceded by a continuous production of sporangia. The gametes 

 are multinucleate. Each oogonium is accompanied by a smaller 

 adjacent antheridial cell, the contents of which pass into the oogo- 

 nium through the gelatinised wall. Nuclear fusion was not seen, 

 owing to difficulties of Observation, but most probably the male and 

 female nuclei fuse in pairs. The oospore is multinucleate. 



E. M. Wakefield (Kew). 



Britton, E. G., Fungi on mosses. (The ßryolosrist. XIV. p. 103. 

 Nov. 1911.) 



The hosts of Cladosporium spibryum Cooke & Massee, to which 

 reference was made in the Bryologist for Ma}\ 1911, are here enu- 

 merated. They are 8 in number and were collected from Canada 

 to Bolivia. Maxon. 



Cotton, A. D., On the structure and systematic position 

 of Sparassis. (Trans. Brit. Myc. Soc. III. 5. p. 333—339. 1911.) 



The hymenium in the genus Sparassis is shown to be unilateral 

 and not amphigenous as was formerly thought; this being true of 

 the European species (S. crispa and S. laminosa) and also of the 

 American. The unilateral hymenium is doubtless connected with the 

 frondose branches which show a tendency to become horizontal. 

 The systematic position of the genus is discussed, and the writer 

 suggests that, since it can no longer be retained in the Clavaricae, it 

 should be placed pro tem. in the Thelephoreae (sensu Massee) 

 where it appears to form a special section. A. D. Cotton. 



