| Abstrakt: |
Hymenagaricus is a genus of small, veiled agaric mushrooms in family Agaricaceae. Species of the genus are distributed in paleotropical region. The members of this genus are characterized by a squamulose pileus, squamules consisted of hymeniform or pseudoparenchymatous tissue, and the absence of both pleurocystidia and clamp connections. In the present study, a robust phylogeny of Agaricaceae is provided, where Hymenagaricus formed an independent lineage with strong phylogenetic support. Molecular clock analyses using BEAST, based on internal transcribed spacer region (ITS1-5.8S-ITS2 = ITS) and D1/D2 domains of large subunit of nuclear ribosomal DNA (28S), and TEF1α sequence data of Agaricaceae, suggested that the maximum crown age of Hymenagaricus is approximately 51.83 million years (Myr). Furthermore, we also reported three new species in the genus, namely Hymenagaricus floccosus, Hy. pelliculosus, and Hy. striatus from lowland in northern Pakistan. These species are described based on morphological features of basidiomata and molecular phylogeny of above three DNA regions. Morphologically, Hymenagaricus floccosus has densely, whitish floccose fibrils which covering pileus and stipe surfaces and brownish cap center without prominent pellicle. Hymenagaricus pelliculosus is characterized by a pelliculose pileus, where pellicle forms a crown-like structure on cap center, a unique feature in the genus. Hymenagaricus striatus is characterized by a reddish-brown pellicle at center, pileus surface striate towards margin, and margins are appendiculate. With this study, the number of known species in the genus increased to 24. It is concluded that the low altitude mountains of Malakand region are rich in the diversity of Agaricaceae and further taxonomic studies are suggested. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink