Type studies of six Venturia species
Zhang, Jia-Qi; Zhou, Yu-Pei; Dou, Zhi-Peng; He, Wei; Zhang, Ying
Type specimens of Venturia centaureae, V. chrysanthemi, V. corni, V. helvetica, V. muelleri and V. rhamni are revised, redescribed and illustrated. The diagnosing characteristics of Venturia are: ascomata immersed, semi-immersed or superficial, scattered or gregarious, often with papillate ostiole, with or without setae; paraphyses narrowly cellular, hyaline, evanescent in mature ascomata; asci 8-spored, bitunicate, broadly cylindrical to obclavate, usually lacking a pedicel; ascospores pale olivaceous to brown, 1-septate, usually asymmetrical. The distinguishing morphological characteristics of V. corni are the numerous asci per ascoma, the narrowly fusiform, middle-septate, sub-hyaline to pale brown ascospores, and absence of paraphyses. These characteristics differ from those of other described species of Venturia and are more typical for members of Mycosphaerellaceae (Capnodiales). Based on morphological data, V. corni should be excluded from Venturia.