ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 201 



due to a parasitic fungus, Macrosporium Sydoivianum sp. n. The 

 damage is confined to the surface of the fruit, the interior tissue not 

 being affected ; but when the fruit is attacked at an early stage its 

 growth is stopped. Spore-development is described, and a diagnosis 

 of the species is added. 



Rhacodium Cellare as a Hemiparasite.* — Vittorio Peglion describes 

 a case in which the cellar fungus, a saprophyte, developed as a parasite, 

 attacking stored chestnuts, and sometimes destroying large numbers of 

 them. The mycelium is white at first, but becomes deep brown with 

 age. The fructification recalls that of Cladosporium, CJadotrichum, etc. 



Biology of Helminthosporium gramineum.f — F. Noack confirms the 

 work already done by Diedicke on this fungus, and adds notes and 

 observations that he himself has made. Towards the end of the year 

 the fungus forms sclerotia, which have been found on barley stubble, 

 and on these are produced perithecia of Pleospora trichostoma. The 

 author made cultures of the ascospores, and got again the mycelium and 

 spores of H. granmieum. The " streak " disease due to this fungus is 

 produced in the early part of the year, and may arise from mycelium in 

 the chaff of the seed, from conidia adhering to the seed, from the first 

 beginnings of sclerotia attached to the sueaths, or from ascospores. The 

 author considers that the disease causes considerable loss. The fungus 

 grows only on Hordeum distichium. Deep ploughing of the stubble 

 would be advisable to prevent the spread of the disease. 



Vegetative Life of the Rust Fungus.} — Jacob Eriksson con- 

 tinues his studies on Uredineas. He passes in review the possible 

 methods of development of these fungi. He caused all barberry bushes 

 to be uprooted in the near neighbourhood of his experimental plots, and 

 shows the impossibility of infection having taken place from secidio- 

 spores. He thinks it possible that infection may be caused by sporidia, 

 though that has not been proved experimentally. Wintering of the 

 fungus he states is impossible in the uredo stage. Eriksson examined 

 young blades of grass, where the fungus might be expected to appear, 

 and found no trace of mycelium, but he found the more dense con- 

 dition of the protoplasm indicating the presence of mycoplasma. At 

 more advanced stages he saw the mycoplasm developing to fungus 

 mycelium, and the disorganisation of the host-cells. 



Uredineae. — I. Yestergren § has prepared a monograph of the species 

 of Uromyces that grow on Bauhinia. The material was collected 

 mostly in Brazil. Only one species has been found in the Old World, 

 Uromyces verrucidosiis on Bauhinia tomentosa, in Ceylon. Vestergren 

 gives an account of 17 species, several of which are new. 



H. 0. Juel || has conducted a series of culture experiments with the 



* Atti R. Accad. Lincei, cccii. (1905) pp. 740-3. 



t Zeitschr. Pflanzenkr., heft 4 (1905). See also Centralbl. Bakt., xv. (1905) 

 pp. 484-5. 



% Kgl. Svenska. Vetensk. Akad. Handl., xxxix. No. 5 (1905) pp. 1-41 (2 pis.). 

 See also Bot. Centralbl., xcix. (1905) pp. 586-7. 



§ Arkiv Bot., iv. No. 15 (1905) 34 pp., 2 pis. 



|| Op. cit., No. 16 (190 ) 5 pp., 1 fig. 



