Algae. — Fungi. 91 



Meneghini, Rabenhorst, Garbini, Kirchner, Forti giebt 

 Veri. ein 442 Arten umfassendes Verzeichniss. 



J. B. de Toni (Sassari). 



KEELEY, Frank J., Structure of Diatoms. (Proceedings of 

 the Academy of Natural sciences of Philadelphia. LIII. Pt. 3. 

 p. 321—323. 1901.) 



Records methods used in demonstrating differences in the 



structure of certain diatoms. Moore. 



Keller, Ida A., A peculiarcondition o f Oedogonium. (Pro- 

 ceedings of the Academy of Natural sciences of Philadelphia. 

 LIII. 1902. Pt. 3. p. 598— 60 1. fig. 1—9.) 



Describes an Oedogonium which had lost all its Chlorophyll 



and yet continued to live and, it is believed, grow. Moore. 



COPELAND, E. B., The conjugation of Spirogyra crassa Kg. 

 (Bulletin of the Torrey Botanical Club. XXIX. p. 161—163. 

 March 1902. Fig. 1.) 



From the manner in which the conjugation of this Spirogyra takes 

 place the author concludes that the filaments are completely dioecious. 

 The movements of the nuclei in the conjugating cells are described. 



Mac Dougal. 



Mac Millan, Conway, Observations on Pterygophora. 



(Minnesota Botanical Studies. II. p. 723—741. pl. 57—62. 



May 15, 1902.) 



Pterygophora californica, as found in the Straits of Fuca, is a surge 

 plant growing below the zone of Lessonia and above that of Nereocystis. 

 Specimens 10 feet in Jength, with trunks 3 inches in diameter, are repor- 

 ted. The holdfast shows well marked rings due, in most cases, to diffe- 

 rences in the cell Contents; the substances which produce this ringed 

 appearance being regarded as polysacharids allied to mucine. The stipe, 

 also shows distinct rings which may be due, either to the same con- 

 ditions as in the holdfast, or to the juxtaposition of a layer of cells with 

 larger lumina. In the cortex of the lamina, large polysacharid idio- 

 blasts are developed, being most numerous in the pinnae and often loo- 

 sing their Contents during the formation of sori. The plant fruits in 

 December at Port Renfrew, the sori being distributed in irregulär patches 

 towards the base of the pinnae. Pterygophora shows characters, in many 

 respects, intermediate between the Laminarieae and the Alariideae and 

 may be classed with either. Moore. 



PEGLI0N, V., La peronospora del frumento (Sclerospora 

 graminicola) nel Ferrarese. (Rendiconti d. R. Accademia 

 dei Lincei. Vol. XI. p. 389—392.) Maggio 1902. 



L'auteur, qui s'occupe depuis deux ans du Peronospora du 

 ble, avait autrefois exprime l'opinion que l'infection peronospori- 

 que pouvait se relier aux effets de la submersion prolongee du 

 ble ä la suite d'inondation, en la subordonnant cependant ä la 

 presence, dans les environs des champs, de roseaux (Phrag- 

 mites communis) qui sont les hötes naturels des germes du 



