ZOOLOGY, AND BOTANY, MICROSCOPY, ETC. 687 



Hyphomycetes.* — G. Lindau continues in this third part the de- 

 cription of the Aspergilleae begun in Part II. Under Aspergillus he 

 includes the genus Sterigmatocystis, with Septromyces opizii&s a monstrous 

 form of S. nigra. Citromyces and PeniciUium are also described. The 

 latter genus, he remarks, is in great need of revision. 



Uredineae. — D. McAlpinef corrects misconceptions that have arisen 

 concerning the uredospores of Puccinia Pruni. A number of observers 

 have described them as being of two kinds. McAlpine disproves this. 

 The uredospores are all alike, but sometimes the two cells of the teleuto- 

 spore fall apart, and the lower has been figured and described as a second 

 kind of uredospore. 



H. and P. Sydow % describe a series of new or critical species from 

 Japan, Africa, Mexico, etc. 



C. A. J. A. Oudemans § writes a note on Puccinia veratri, which has 

 been erroneously described as a Uromyces. 



A. Trotter || gives an account of Uromyces giganteus, a species found 

 on the stalks of Suaeda maritima ; he finds a variety on S. fruticosa also, 

 growing on the stalks and deforming them. 



Fr. Bubak IT gives a list of seven forms of Uredinese, in which he 

 has conducted successful inoculation experiments. He notes that in 

 Sedum boloniense the aacidium mycelium of Puccinia longissima is 

 perennial. 



Fertilisation, Alternation of Generations, and General Cytology of 

 the Uredinese.** — V. H. Blackman has published the full paper, a short 

 account of which appeared in the New Phytologist, iii. 1004, pp. 24-27. 

 He reviews the history of research and opinion as to the sexuality of this, 

 group of fungi, describes the methods he employed, and then gives the 

 results arrived at by himself. After describing the morphology, cytology 

 and germination of the teleutospores of Phragmidium violaceum and 

 Gymnosporanghim clavariavforme, he passes on to a consideration of the 

 sperm ogonia of these forms. They arise from a uninucleate mycelium. 

 The spermatia are also uninucleate, and, when mature, are extruded and 

 lie on the leaf surface, where many of them seem to undergo a process of 

 degradation : they took no part in ascidiuni formation, and were never 

 observed to germinate. The gecidium of Phragmidium, which the writer 

 takes next in order, also arises from a uninucleate mycelium. The cells 

 of the eecidiuni immediately below the epidermis of the hosts elongate, 

 and cut off a sterile cell at the tip, the nucleus of which becomes dis- 

 organised ; the cell below is the fertile cell that gives rise to the ascidio- 

 spores ; at first uninucleate, it becomes binucleate from the passing into 

 it of the nucleus of a neighbouring cell, usually the one immediately 

 below. The migrating nucleus passes through the cell wall. The 

 paired nuclei then divide by conjugate division, and binucleate secidio- 

 spores are cut off from the fertile cell. The migrating process was 

 not observed in Gymnosporangium, but the development proceeds in 

 the same way from uninucleate mycelium to binucleate ascidiospores. 



* Rabenhorst's Kryptogamen-Flora, viii. Lief. 94, pp. 129-76. 



+ Ann. Mycol., ii. (1904) pp. 344-8. X Tom. cit., pp. 349-51. 



§ Tom. cit., p. 358. || Tom. cit, pp. 359-60 (1 fig.). 



i Tom. cit., p. 361. ** Ann. Bot., xviii. (1904) pp. 323-73 (4 ph.). 



