218 ASCOMYCETES. 



Physalospora laburni (Bouord.) occurs on living twigs of Ci/tisus LahurHum. 

 Ph. fallaciosa Sacc. On withering leaves of Aletris and Musa in Berlin 

 Botanic Garden. 



Didymosphaeria. 



Peritlieeia similar to Fht/si/hispn/yi, Init with two-celled spores. 



Didymosphaeria genistae Fuek. occurs on (Jenista pilosa. 



D. epidermidis (Fries). On living branches of Berbens, Sambucus, Salu\ 

 and Eiicidjiptns. (Britain and U.S. America). 



D. albescens Niessl. On living branches of Lonicera Xylosteum and 

 Myricaria germanica. 



D. dryadis (Spegazz.). On living leaves of Dryas octopetala. (U.S. 

 America). 



D. populina Vuill. Prillieux and Vuilleniin ^ regai-ii this as a parasite, 

 and the cause of a peculiar dying-olF of Popuhis pyramidalis throughout 

 Germany ; Rostrup, on the other hand, ascribes this to Dothiora sphacriodes 

 Fr. Prillieux regards Napidadium trenndae as a conidial form of Didymo- 

 sphaeria ; Yuillemin, however, believes it to be saproijhytic. 



Venturia. 



The perithecia are embedded in the stroma, and have stiff" 

 bristles round the pore ; they contain both paraphyses and 

 eight-spored asci. The spores are two-celled, with or without 

 colour. 



Venturia geranii Fr. occurs on the living leaves of Geranium pusilh'.m, 

 G. .nolle, etc. 



V. rumicis (Desm.). On withering leaves of Itvme.r. (Britain). 



V. maculaeformis (Desm.). On living leaves of Epilobinni. 



V. vermiculariaeformis Fuck. On withered leaves of Euonymus europaeus 

 anil Lonici:ra Xylusteum. 



V. Straussii Sacc. et Roum. This I havi- fdund as a parasite on Erica 

 carnea in Tyrol. It is also said to cause a disease on Ericaceae in France. 



The various conidial I'oniis at present placed amongst the 

 "Fungi imperfecti " as Fi'HicIdjIiiiui are proljaldy related to 

 Venfvrii'. 



Fusicladium dendriticum AVallr. on apple, and F. pirinum 

 Lil). on pear, are at present the sul)ject of an in\-estigation at 

 tlie hands of Aderhold,- who has, on account of their perithecia, 



^Bidlef. de la sor. myrol. d,: France, 1S92; Conipf. rem/., 1SS9 ; Rcrw mijrol., 

 1892. 



-Aderhold, "Die Perithecienforni v. Fns. deudriticiim '' yorliiwtig Mittlieiluiig> 

 Ber. d. dcidsch. hotan. Ges., 1894, p. 338. 



