ZOOLOGY AND BOTANY, MICEOSCOPY, ETC. 445 



Dr. V. Peglion * describes the injuries inflicted on cereal crops in 

 Italy by the attacks of Sclerospora graminicola, which attacks also other 

 kinds of grass, and with which he identifies S. Kriegeriana parasitic on 

 Phalaris arundinacea, and S. macrospora parasitic on an Alopecurus. 



H. von Schrenk f describes fully a disease of Robinia Pseudacacia, 

 produced by Polyporus rimosus. 



The chrysanthemum-rust, Puccinia Chrysanth&mi, is identified by 

 E. Jacky J with P. Tanaceti and P. Balsamitse. It attacks only Chrys- 

 anthemum indicum, and is characterised by its two-celled uredospores. 



Histological Researches on the Sporulation of Yeasts. § — A. 

 Guilliermond, from an examination of numerous yeasts, and particularly 

 of S. Ludivigii, states that at the commencement of spore-formation the 

 red granules become, as it were, dissolved, and appear to behave like 

 reserve bodies. He confirms the observations of previous writers who 

 attributed to these granules a large share in the formation of the spores 

 of yeasts and bacteria, and of others who considered them to be reserve 

 substances. 



Intracellular Nutrition of Yeast. || — E. Kayser finds that the acidity 

 produced on fermentation by yeast and caused by volatile and fixed acids, 

 is dependent on the nature of the medium and the conditions of the 

 fermentation. The presence of acetic acid or pepton decreases the 

 amount of fixed acids, but both fixed and volatile acids are increased 

 in quantity by the presence of phosphates. The amount of aeration 

 also has an effect on the relative quantity of fixed and volatile acids 

 formed with fermentation. 



Adaptation of the TJredineae to their Substratum."f[ — P. Hennings 

 calls attention to several instances in which two so-called species of 

 Uredinese growing on different host-plants are apparently morpho- 

 logically identical with one another. He draws the conclusion that 

 the structure of the leaf has much more to do with the parasitic fungi 

 found upon it, than the genetic relationship of the host-plant. The 

 structure of the leaf as to thickness, firmness, and degree or nature of 

 hairiness, must necessarily largely determine the species of parasitic 

 fungi which can develop upon it. 



Fulminaria mucophila g. n.** — C. Gobi finds this parasite, which 

 he identifies with Lagerheim's Harpochytrium Hyalothecse, on all algaa 

 which have a broad gelatinous sheath, especially on desmids. It con- 

 sists of a very slender capilliform but solid stalk, which attaches itself 

 to the membrane of the host, and a usually sickle-shaped body which 

 becomes afterwards transformed into a zoosporange. The individual is 

 derived from a pear-shaped swarmspore which has a single flagellum 

 at its narrower end, and which has the power of exceedingly rapid 



* Atti r. Accad. Lincei, x. (1901) pp. 262-5. 



t Twelfth Ann. Kep. Mo. Bot. Gard., 1901, pp. 21-3 (3 pis.). See Bot. Gazette, 

 xxxi. (1901) p. 206. 



X Zeitschr. f. Pflanzenkrank., ^x. (1900) p. 132. See Bot. Centralbl., lxxxvi. 

 (1901) p. 34. § Comptes Rendus, cxxxii. (1901) pp. 1194-6. 



|| Ann. Inst. Pasteur, xiv. (1900) pp. 605-31. See Journ. Chem. Soc, lxxx. (1901) 

 p. 263. f Hedwigia, xl. (1901) pp. 125-8. 



•* Script. Bot. Hort. Univ. Imp. Petrop., fasc. xv. pp. 283-92 (I pi.). See Bot. 

 Centralbl., lxxxvi. (1901) p. 149. 



