MARASMIUS TENUISSIMUS (AGARICALES, MARASMIACEAE): MARASMIOID THREAD BLIGHT DISEASE FROM SORONG, WEST PAPUA, INDONESIA

Marasmius tenuissimus is one of the marasmoid thread blight diseases that infects commercial, such as cacao and coffee, and non-commercial plants. The species is characterized by a medium fruiting body, an irregular convex to plano-convex pileus; remote, interwoven, and anastomosing lamellae; absence of stipe; Siccus-type broom cells of cheilocystidia and pileipellis. As part of an inventory of the genus Marasmius in Indonesia, this study aims to document the species diversity of the genus within the region. Field exploration was conducted in Sorong, followed by specimen drying, herbarium processing, and identification using both morphological and molecular analyses. Observation and phylogenetic analyses using nrDNA ITS highlighted the taxon placement of our new collected marasmioid species as M. tenuissimus and also provided the nucleotide sequence data which will be valuable for future study of fungal diversity in Indonesia.