Sl'IGMATEA. 211 



new conidial cushions may appear. The mycelium itself is 

 brown. From winter to spring, brown perithecia containing 

 eight-spored asci may be found on the same leaves formerly 

 occupied by the conidia. The colourless spores consist of two 

 unequal cells ; they germinate in May, before or after ejaculation 

 from the asci, and bring about new infections. 



St. polygonorum Fr. occurs on leaves of Polygonum. (Britain and U.S. 

 America). 



St. andromedae Rehm. On living leaves of Andromeda polifolia. 



St. alni Fuck. On living leaves of Alnus glutinoia. 



St. juniperi Desm. On living needles of Juniperus communis. 



Ascospora. 



The mycelium forms brown crusts under the host-epidermis, 

 and there the perithecia develop. The asci are small and 

 contain unicellular hyaline spores. The perithecia contain no 

 paraphyses. 



Ascospora Beyerinckii Vuill.-^ The conidial form of this 

 fungus {Coryneum BeyeriTickii) produces a form of the " gum- 

 flux " of cherry ti'ees. The mycelium lives in leaves of cherry, 

 peach, plum, apricot, almond, which in consequence become 

 spotted, and die off along with the young fruit. Mature 

 perithecia may be found in spring. The fungus lives to a 

 certain extent as a saprophyte. 



Sphaerella. 



The delicate perithecia are embedded in the tissues of the 

 host-plant; they contain asci with two-celled colourless spores, 

 but no paraphyses are present. 



Sphaerella laricina Hartig.^ The needle-cast fungus of 

 Larch. This fungus is the cause of a dangerous larch-disease 

 found everywhere, except in mountainous localities over 1200 

 metres. The symptoms of disease consist in the needles becoming 

 brown-spotted and falling prematurely in summer. Cushions of 

 conidia are formed in June on the brown spots ; these enlarge, 

 and from their surface rod-shaped, four-celled conidia are 



^ Vuillemin, Titres ei travaux scieTiiiJiqnes, 1890. 



^ R. Hartig, Forstlieh-naturwisis. Zeitschrift, 1895, p. 445. 

 Through the kindness of Prof. Hartig we have been enabled to add an 

 account of this important new disease, with the accompanying figures. (Auth. 

 and Edit.) 



