Soil-Inhabiting microscopic fungi of the foothill forests of Bu Gia Map National Park (Vietnam)

The information about species composition and conformation characteristics of microfungi’s complexes in the soil and leaf litter of specially protected natural areas of Vietnam. The mycological examinations of the Bu Zia Map National Park were carried out for the first time. List of species that was found by dilution plate method from 60 samples includes 88 species of microscopic fungi belonging to 42 genera and 15 types of sterile forms. 13 species of them were not observed previously for Vietnam. Mucoromycota was represented by only two species that related to the order Mucorales. Basisiomycota was represented by only one species. The most of identified fungi belongs to Ascomycota, domitant part of them is anamorphic. The leading orders are Eurotiales (42 species) and Hypocreales (17 species). Among the anamorphic forms there is a lot of different species Aspergillus and Penicillium. In soil from dipterocarp forest were identified 36 species microscopic fungi from 19 genera and eight sterile forms were isolated. There are three species were included in the group of dominants: Aspergillus tubingensis, Penicillium ochrochloron, Trichoderma harzianum. On a forest with Lagerstroemia sp. (Lythraceae) was found 47 species from 24 genera and 4 sterile forms were isolated. In the palm tropical forest area with Arenga westerhoutii (Arecaceae) 44 species of micromycetes from 27 genera and 5 sterile forms were isolated. The number of typical (dominant and frequent) species is very large, especially for the complex of micromycetes of the soil. Purpureocillium lilacinum and Trichoderma harzianum were also present. Rare tropical fungi have been found, such as Heterocephalum taiense, Chaetomella circinoseta and C. raphigera – soil fungi that are usually isolated from tropical soils and plants. Endocalyx melanoxanthus that has a tropical distribution and is associated with palm trees was found in Vietnam for the first time. The micromycete Thielaviopsis radicicola which is a rather serious pathogen of palm was found in the soil in a forest area with a predominance of Lagerstroemia sp. Complexes of micromycetes of the studied forest areas are divided into groups according to the types of habitats studied and by the types of different substrates. The complexes of micromycetes that were found in the soil and on the litter of the Lagerstroemia forest are very different. The degree of study of the species composition for all habitats is not very high: from 56 to 78%. Further studies of this group are promising and may lead to the identification of new species.