Algae. — Fungi, Myxomyceten, Pathologie. 619 



The normal course of irfection. 5. The significance and the conse- 

 quences of the association of animal and green cell. 7. General Sum- 

 mary. The infecting organism of Convoluta is found to be an alga 

 belonging to the Chlaniydomonadeae , which in its free stage bears 

 four equal flagella and possesses the general characters of members 

 of this family. It may possibly be a species of Carteria. The active 

 cells are of two sizes^ but neither large nor small cells appear to 

 be obligate gametes. The organism is capable of a saprophytic as 

 well as of a holophytic existence; in the former State it may be 

 colourless. The active cells are attracted chemotactically to egg- 

 capsules of Convoluta. They settle down and undergo active vegeta- 

 tive division in the capsules, and are finally liberated as a swarm 

 of four-flagellated active cells. The relation between green cell and 

 animal changes with their development, passing from a symbiotic 

 relation to one in which the animal is parasitic on the vegetable cells. 

 The consequences of the association so far as the alga is concer- 

 ned are: hypertrophy, nuclear degeneration, premature senescence 

 and death. The results of various experiments are shown by the 

 help of tables. The paper is illustrated bj^ two plates. E. S. Gepp. 



Adams, T., Irish Parasitic Fungi. (The Irish Naturalist. Vol. XVI. 

 May 1907. p. 167—169.) 



A Short list of Parasitic Fungi that have not previously been 

 recorded as natives of Irelend. Two species are described as new, 

 Claviceps Junci, and Cicinnobolus Ulicis. A. D. Cotton (Kew) 



Anonymus. A Pine Disease {Diplodia pinea). (Journal of the 

 Board of Agriculture Vol. XIV. June 1907. p. 164—166.) 



Diplodia pinea is described as causing a disease oi Pinusstrohus 

 and P. sylvestris. The disease is confined to the terminal shoots and 

 is recognised by the yellowing and subsequent shedding of theleaves 

 foHowed by the death of the shoot. The fungus is shown to be a 

 wound parasite; the mycelium extends almost entirely in an upward 

 direction, hence the length of the dead shoot depends on the distance 

 of the wound below the apex of the shoot. The Diplodia fruit is not 

 produced tili the foUowing year. A. D. Cotton (Kew). 



Atkinson, G. F., A Mushroom parasitic on ^another Mush- 

 room. (The Plant World, X. p. 121. 1907.) 



The writer describes a fungus parasitic on Coprinus atramenta- 

 rius, describing the same under a new name, Stropharia epitnyces 

 (Peck). He gives an interesting discussion as to the manner in which 

 the parasitism of this fungus began. The paper is illustrated with 

 two plates and a figure showing details of structure of the fungus. 



H. von Schrenk. 



Atkinson, G. F., The Development of Agaricus campestris. 

 (Botanical Gazette, Vol. XLII. 1906. p. 241—264. Plates 7—12.) 



The material for this work was a very complete series of stages 

 in the development of the carpophore of a commercial variety of 

 Agaricus campestris known as Columbia. Fruit bodies l'"'^ in 



