Abstract
This study shows the conidiomatal development of Pestalotiopsis disseminata (Thuen.) Stey., using light and transmission electron microscope. Light microscopic study showed the presence of non-ostiolate pycnidial conidiomata in culture, whereas it is known to produce only acervular conidiomata on leaves. Interestingly, the fungus showed the ultrastructure of the conidial wall in the coloured cells as well as the basal and apical hyaline cells with the appendages. P. disseminata was studied for the first time on the development of the conidiomata and conidia by light and transmission electron microscopes. Key words: Coelomycetes, Conidiomata, conidium ontogeny, appendages.
Highlights
Traditional classification of coelomycetes was based on morphology and was subjective, often resulting in artificial generic and species boundaries (Wijayawardene et al, 2012)
Coelomycetes have conidia formed within a cavity lined by fungal or fungal host tissue
The conidiabearing structure is classified into five types according to exterior morphology: pycnidial, pycnothyrial, acervular, cuplate and eustromatic (Hawksworth et al, 1995)
Summary
Traditional classification of coelomycetes was based on morphology and was subjective, often resulting in artificial generic and species boundaries (Wijayawardene et al, 2012). The conidiabearing structure (conidioma) is classified into five types according to exterior morphology: pycnidial, pycnothyrial, acervular, cuplate and eustromatic (Hawksworth et al., 1995). The genus Pestalotiopsis steyaert is a heterogeneous group of coelomycetous consisting of 205 described species that are differentiated primarily on conidial characteristics such as size, septation, pigmentation and presence or absence of appendages (Sutton, 1980). These facts suggest that the morphogenesis of conidioma has taxonomic value. Development is divided into three stages: primordia, cavity formation and conidiogenesis with each pycnidial fungus having a determinate mode in each stage
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