PSEUDOPEZIZA. 255 



spores are ovoid or elliptical, colourless, and unicellular. The 

 colourless paraphyses have thickened apices, rarely forked. 



Pseudopeziza (Phacidium) trifolii (Bernh.). Leaf-spot 

 disease of the clover. This disease appears on the leaves of 

 various species of clover in Europe and America ; its attacks 

 may attain considerable severity, and inflict great injury to 

 crops. The leaves become spotted, and finally die off. The 

 apothecia occupy brownish-yellow discs on the surface of the 

 leaf, and hence are not unlike pustules of a Puccinia. The asci 

 are club-shaped, and contain eight ovoid, unicellular, colourless 

 spores. The paraphyses have broadened apices, rarely forked. 

 A conidial form (Sphaeronema phacidioides Desni.) is generally 

 allocated to this species. 



Ps. trifolii {var. medicaginis) (Lib.) is found on species of Medicago 

 (Britain and U.S. America). 



Ps. bistortae (Lib.). This occurs on tlie lower epidermis of living leaves 

 of Polygonum Bistorta, and P. vivipanim, causing dark-brown swollen 

 spots where the apothecia are developed. Juel ' has transferred this species 

 to the Phacidiaceae, and named it Psewdorhytisma bistortae (D. C). 



Ps. alismatis (Phill. et Trail) causes spots on leaves of Alisma Plantago 

 (Britain). 



Fabraea. 



This genus is distinguished from Pseudopeziza by the spores, 

 which, though at first unicellular, become two or four-celled. 

 The species are parasitic in the leaf-tissue of higher plants. 



Fabraea astrantiae (Ces.). The mycelium lives in the leaf- 

 parenchyma of Astrantia major and A. carniolica, causing dead 

 spots. A form occurs on Sanicula europaea. 



F. ranunculi (Fries.) (Britain). The apothecia of this are 

 very common on brown spots on the leaves of various species 

 of Banunculus. 



F. cerastionim (Wallr.) frequents leaves of Cerastium (Britain). 

 F. Rousseauana (Sacc. et Bomm.) occurs on leaves of Caltha palustris. 

 (A British species if synonymous with Pseudopeziza caltliae Mass.). 



Beloniella. 



The gregarious apothecia are at first embedded, but break 

 out later. Externally the apothecial discs are rough, dark brown, 



^ Mylcol. Beitr. Veiensk.-Ahad., 1894. 



