ZOOLOGY AND BOTANY. MICROSCOPY, ETC. 213 



Puccinia graminis ou cereals and ou several grasses is only known there 

 in the nredo and telento stage, and of this species he differentiates 

 thi-ee distinct forms. The last of the three on oats is unknown in 

 India, but Indian oats grown in the Transvaal are highly susceptible to 

 both P. graminis and "to the other oat rust, P. coronifera. Attempts 

 have been made to breed rust-resistant plants. It has been found that 

 the hybrid between an immune and a susceptible plant has an even 

 increased susceptibihty ; the author suggests that owing to its hybrid 

 nature it may have richer cell-contents. Further, the rust is so 

 strengthened by its growth on the hybrid that it is able thereafter to 

 infect the immune parent. 



Uredineag.* — S. Kusano has published a paper on the chloranthy of 

 Primus Mume caused by Cseoma Makinoi, the leaves of which remain 

 green when attacked by the fungus. If the bud is infected at a very 

 early stage, no leaves are formed, but only a vegetative shoot ; with a later 

 infection the leaves do not fade, and there are all stages between these 

 two extremes. The winter buds may be infected from the mycelium in 

 the twigs or from spores. 



E. Szekacsf by observation and experiment finds that wheat races 

 that have no resistance to rust-infection were covered with the fungus 

 by the middle of May. Neighbouring patches of wheat were intact or 

 only slightly rusted. This proves, he considers, that the rust is not only 

 due to infection from the fecidiospores, but is an inherited disease that 

 appears with the first weather conditions favourable to its growth. The 

 seed is the disease-carrier. An account is given of the endeavour to 

 cultivate immune races of wheat. The author is a firm believer in 

 Eriksson's mycoplasma theory. 



J. C. Arthur I publishes his report of Cultures of Uredineae in 1910. 

 A large series of spore cultures were undertaken, and both successes and 

 failures are recorded. The successful cultures reported for the first time 

 are : — Puccinia. CrancMlii on Festuca confinis formed aecidia on Sym- 

 phoricarpus racemosiis ; P. quadriforula on Garex Goodenoviimiected Aster 

 jmniculafiis ; P. Lithospermi on Gonvolvuhis pilosus produced a scanty 

 infection on the same host. Uromyces acuminatus on Spartina Mich- 

 auxiana was tested on different plants : it produced aecidia and pycnidia 

 on Polemonium reptans only. Peridermiiim carneum taken from Pinus 

 Taeda produced uredosori on Vernonia crinita. MeJampsora Albertensis 

 from Populus tremuJoides formed ascidia and pycnidia on Pseudotsuga 

 mucronata. In aU, six new successful cultures are described, and thirty- 

 four cultures of forms already determined. 



B. Namyslowski§ publishes notes on several Uredineae, on Uromyces 

 tarpathicus from the under surface of the leaves of Geranium pJiseum, 

 which has warted minutely papillate spores. He found a new jBcidium, 

 unrelated as yet, on Aposoeros ffetida, and another which may be identical 

 with ^cidium Cichorii. 



* Journ. Coll. Agric. Tokyo, ii. (1911) No. 6 (2 pis, and 3 figs.). See also Zeitschr. 

 Bot. iii. (1911) p. 810. 



t Wiener Landw. Zeit., Ixi. (1911) p. 609. See also Bot. Centralbl., cxviii. 

 (1911) p. 63.3. X Mycologia, iv. (1912) pp. 7-33. 



§ Kosmos, xxxvi. (1911) pp. 293-9 (figs.). See also Hedwigia, li. (1911) p. 189. 



April 17th, 1912 Q 



