Scanning electron microscopy of Stilbella annulata

Abstract

The synnematous hyphomycete Stilbella annulata from South Africa is redescribed with the aid of scanning electron microscopy. The synnemata produce sterile lobed marginal hyphae which develop terminally as a result of determinate growth. No abscission takes place. The fertile hyphae form an umbel producing a slimy ball of red conidia on top of the determinate synnemata. Conidiogenous and lobed cells are also produced from the vegetative surface hyphae of the substrate. No differences in morphology between the fungus on the host substrate and in pure culture were observed.

Key Words:

• conidiogenesis
• morphology
• scanning electron microscopy
• synnemata