750 SUMMARY OF CURRENT RESEARCHES RELATING TO 



dealt with, and a beginning is made with the Tuberculariaceas dematieae, 

 in which the fruiting body and spores are more or less dark-coloured. 

 There are ten genera enumerated, with simple spores. 



Pigment-forming- Penicillium.*— H. Doebelt has investigated the 

 formation of pigment in Penicillium africaimm ; it forms a blood-red 

 mycelium in certain culture media, with a sulphur-yellow margin round 

 the edge of the culture. Attention was directed specially to the connec- 

 tion between the substratum and the colour formation, very little colour 

 being formed on a carbohydrate medium. Nitrogen from organic 

 sources encouraged the red growth much more than the nitrogen of in- 

 organic compounds. High osmotic pressure acted as a deterrent both 

 of colour formation and of mycelial growth ; high temperatures aided 

 growth while acting unfavourably on the colour ; light had no influence 

 on the pigment ; acids completely stopped the colour ; oxygen was 

 necessary for growth and for pigment. The presence of other fungi 

 induced a more active pigment formation, and where the substratum 

 lacked the salts necessary for the colour formation, the addition of certain 

 fungi insured its presence. 



Uredinese.j — P. Dietel describes a number of new species. A new 

 Phragmidium from Africa on Rubus Volkensii, with 3-celled, or, rarely, 

 2-celled teleutospores ; other novelties are from South America and 

 Japan — species of Puccinia, Coleopuccinia, Gpleosporium, and Hyalospora. 



Fr. BubakJ describes a new JEeidium from Japan on Scopolia 

 japonica, and also a Puccinia of the same type as P. Poarum. He found 

 in the sorus two forms of teleutospore, 1- and 2-celled spores in equal 

 proportions, both of them variable in size and form. He names it 

 P. cognatella ; host-plant, Poa nemoralis var. umbrosa. 



A German translation § of Bubak's Rust-fungi of Bohemia has been 

 issued. Bubak records some 312 species, and is personally responsible 

 for most of the localities given. 



A new species || of Sphserophragmium is described by P. Hariot and 

 N. Patouillard. It grew on one of the Anonaceaa in West Africa. A 

 diagnosis of the species is given, with figures of teleutospores, 6-to 

 8-celled, and ornamented with short hairs. 



F. D. Kern % describes a new species of Gymno sporangium from 

 Colorado, which grew on Sabina monospermy The cells of the teleuto- 

 spores have each five to seven large scattered germ-pores, a very unusual 

 character, no other species having been observed with more than two. 



Griffon and Maublanc** describe a new rust of orchids in hot-houses, 

 Hemileia Oncidii. It forms spreading yellow patches on the leaves. The 

 mycelium forms haustoria which pierce the cells of the host-tissue ; the 

 teleutospores are smooth, and smaller than those of H. americana, also a 

 rust of orchids. 



* Ann. Mycol., vii. (1909) pp. 315-38. f Tom. cit., pp. 353-6. 



% Tom. cit., pp. 377-9 (11 figs.). 



§ Arch. Natur. Landesdur. Bohnien., xiii. No. 5, Prag, 1908. See also Ann. 

 Mycol., vii. (1909) p. 387. 



|| Bull. Soc. Mycol. France, xxv. (1909) pp. 108-10 (1 fig). 

 H Mycologia, i. (1909) pp. 208-10 (1 fig.). 

 *• Bull. Soc. Mycol. France, xxv. (1909) pp. 135-9 (1 pi.) 



