Observations on Sphaeronaemella helvellae in culture

Dung, J., Rogers, J. D., Schroeder, Brenda, & Johnson, D. A. (2010).-Observations on Sphaeronaemella helvellae in culture.

Sydowia 62 (1): 37–49

Sphaeronaemella helvellae was isolated from sclerotia of Colletotrichum coccodes on potato. The fungus appears to parasitize the sclerotia of this potato pathogen. Observations on the fungus from pure culture show that ascospores germinate from one or both apices; no germ slits or germ pores are present. The Gabarnaudia anamorph produces conidia in chains from conidiogenous cells. Conidiogenesis appears to be phialidic with aspects of the holoblastic mode. No collarette was detected on the conidiogenous cell. A Gram-positive bacterium, determined by morphology and sequencing to be Leifsonia aquatica, was frequently associated with the fungus and appears to stimulate perithecial production.

Keywords:-Biological control, conidiogenesis, Colletotrichum, Gabarnaudia, perithecia, pyrenomycete, Sphaeronaemella