LTNNEAN SOCIETY OF LONDON. xli 



tlie 25th vol. of the Trans. Liun. See, some observations supple- 

 mentary to his former papers on the Splicerioe of the Hooterian 

 Herbarium. His object has been to show which of the species, 

 previously figured by him, were described from authentic speci- 

 mens, and, with regard to the non-authentic ones, to state by 

 whom the plants have been named. The result shows tliat the 

 Herbarium contains a large number of authentic specimens, besides 

 many which, without being absolutely authentic, are almost (if not 

 quite) as valuable, from having been identified by Fries, and pub- 

 lished by him in the ' Scleromycetes Sueciae ' or described in the 

 * Systema mycologicum.' 



^ The main interest of De Bary's paper on the fructification 

 of the Ascomycetes *, consists in the observations on Erysiphe 

 Ciclioracearum, DC, in which the author traces the origin of the 

 peritheciura from its earliest state up to the formation of the single 

 ascus and spores. He notices two cells as being always present 

 and visible from the earliest period, one of which he conjectures 

 may be the female, and the other the antheridium or male organ. 

 He says that the cell by the division of which the ascus and its 

 coating are formed, only developes itself when it has been in con- 

 tact with the antheridium ; and he considers it very probable that 

 impregnation is efiected by such contact, and that the perithecium 

 of Erysiphe (excepting the outer wall) is the product of such im- 

 pregnation. 



De Bary's paper on vegetable parasites f was undertaken 

 with a view to contribute to the solution of the question as to the 

 origin of parasitic fungi; and he concludes (as might be expected) 

 that endophytes are not produced from the metamorphosed sub- 

 stance of diseased plants, but that they originate from germs 

 which penetrate healthy plants and develope a mycelium. In the 

 course of his investigations he notices the occurrence, in the 

 genus Cystopus, of organs similar to those long since discovered 

 by Tulasne in Peronospora, and which have been called oogonia; 

 He observes that ramifications from the mycelium attach them- 

 selves to the oogonia, and conjectures that these ramifications 

 perform the functions of antheridia or male organs ; and he pro- 



* Ueber die Frachtentwickelimg der Ascomyceten. Eine Pflanzen-physio- 

 logische Untersuchung. Von Dr. A. de Bary. Leipzig, 1863. 



t " Eecherches sur le developpement de quelques champignons parasites. 

 Memoire pour servir de reponse a ime question proposee par TAcademie des 

 Sciences en 1861, et pour servir de Supplement aux travaux sur la question des 

 generations dites spontanees. Par M. A. de Bary." Ann. d. Sc. ser. 4. t. xx. 



