ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 6.9 



been observed by many workers. Wager demonstrated that the re- 

 puted nucleus was the nucleolus only, and that in the vacuole of the 

 yeast-cell he had observed nuclear threads. Marpmann gives an account 

 of the methods whereby he has clearly proved the existence of nuclei 

 both in yeast and bacteria. He immerses the preparations of bacteria 

 in pure carbolic acid after fixation, thus rendering the nuclei more 

 susceptible to staining. The author has also experimented with several 

 species of Schizosaccharomyces. He classifies the yeasts primarily by their 

 colours, as white, grey, yellow-brown, yellow-red, and black yeasts. 



New Sphaeropsidese.* — F. Tassi describes three new genera belong- 

 ing to this group : — Triyonosporium, distinguished by its trigonous hyaline 

 spores, found on dead branches from Sydney ; Santiella, with fusiform, 

 2-celled, brown spores, probably the pyenidial form of Caryospora ; and 

 Hyalothyridium which resembles Camarosporium, but with brown spores. 

 The species of the two latter genera were found in the Botanical Garden 

 at Siena. 



Development of Dipodascus albidus.f — This minute fungus was 

 first discovered by Lagerheim in Ecuador, and by him described and 

 classified as one of the Hemiasci, specially notable as possessing dis- 

 tinctly sexual fructification. H. 0. Juel has recently found the same 

 fungus in Sweden on a fallen birch stem, and he has worked out the 

 different stages in the development of the sexual organs and of the 

 spores. The former arise as projections on one of the hyphre, from 

 which they are cut off after fusion. Each cell contains also several 

 small vegetative nuclei. After copulation a larger nucleus appears, 

 evidently the result of fusion. The ascus grows out from the conjoint 

 cell, and the nuclei increase by free cell-formation from the large nucleus. 

 These cells become clothed with a cell-wall and form the spores. The 

 author discusses the systematic position of this fungus. He considers 

 that it forms a link between the Phycomycetes and the Ascomycetes. 



Nectria moschata.J — H. Gluck gives an account of the occurrence 

 and life-history of this fungus which forms gelatinous masses in water- 

 pipes and on damp wood. The formation of perithecia and the 

 development of the spores is described. 



Cordiceps Robertsii.§ — H. Hill publishes a historical and descriptive 

 account of this fungus which has been called the " vegetable caterpillar.'" 

 It is found all over the North Island of New Zealand. The author has 

 not been able to determine the species of caterpillar attacked by the 

 fungus, and his attempts to germinate the spores on other caterpillars 

 have been as yet unsuccessful. 



Gooseberry Mildew.|| — P. Magnus is of opinion that Spkcerotheca 

 mors-uvce is not indigenous in Europe, but that it ha3 been imported 

 from America. He also demurs to the opinion that it is identical with 



* Bull. Laborat. et Orto Bot, iii. pp. 89-92 (2 pis.). Cf. Centralbl. Bakt., ix. 

 (1902) p. 506. t Flora, xci. (1902) pp. 47-55 (2 pis.). 



t Engl. Bot. Jahrb., xxxi. (1902) pp. 495-515 (2 pis.). 

 § Trans, and Proc. New Zeal. Inst., xxxiv. (1902) pp. 396-401 (1 pi.). 

 || Gartenfl., Jahrg. li. (1902) p. 3. 



