AGLAOSPORA. 229 



Ag. profusa Fr. (Britain and U.S. America). This occurs 

 along with, and probably is some form of Dothiorella rdbiniae. 

 Prillieux and Delacroix' blame it for killing young twigs of 

 Rdbinia pseudacacia in France. 



Fenestella. 



The stroma is similar to Eu-Valsa, and contains several 

 long-necked perithecia. The spores, eight in each ascus, are 

 coloured and multiseptate, as in Cucurbitaria. 



Fenestella platani Tav., to this is probably related Gloeo- 

 sporium nervisequium (Fuck.), the cause of a disease on the 

 leaves of Platanus, and described under Gloeosporium. 



(3) DOTHIDBACEAE. 



Phyllachora. 



The perithecia are small and produced in a black stroma 

 buried in the tissue. The asci contain eight hyaline, oval, 

 and unicellular spores. 



Phyllachora graminis (Pers.). (U.S. America). This species 

 causes elongated black swellings on grasses and sedges (Luzula 

 and Carex). The black perithecia occur massed together, and 

 embedded in the leaves. The asci contain eight hyaline uni- 

 cellular spores. 



Ph. trifolii (Pers.), with conidial form known as Polythrincium 

 trifolii Kunz. (Britain and U.S. America). The mycelium 

 causes the formation of roundish dark spots on the green 

 leaves of clover frequented by it, and death ultimately follows. 

 On the spots, especially those on the lower epidermis of the 

 leaf, the conidiophores make their appearance as brown septate 

 structures, constricted at intervals so as to become rosary-like ; 

 they bear terminal, brown, two-celled conidia, the upper cell 

 of which is somewhat spherical, and larger than the lower. 



Ph. cynodontis (Sacc). On living leaves of Cynodon Dactylon. 

 Ph. podagrariae (Both.). On living leaves of Aegopodium Podagraria 

 (Britain). 



Some other species are found on withering leaves. 



' BuUetin soc. mycol. de France, 1 890. 



