title: Megalohypha, a new genus in the Jahnulales from aquatic habitats in the tropics.
abstract: A new fungus collected from submerged wood in tropical forest streams in Panama and Thailand is described as a new genus and species in the Jahnulales. This fungus, Megalohypha aqua-dulces, is described based on ascospore morphology, which differs substantially from that of the other genera in the Jahnulales. It has these morphological features: ascomata hyaline, translucent, with subtending, wide, brown, septate, stoloniferous hyphae; peridium of large, thin-walled cells; hamathecium of septate pseudoparaphyses; asci clavate, fissitunicate, 8-spored; and ascospores 1-septate, brown, rough-walled, with longitudinal sulcate striations. An interesting feature of Megalohypha aqua-dulces, which it shares with some other taxa in Jahnulales, is the presence of both sessile and stalked fruiting bodies. In addition, the stalks have morphology that consists of a wide hypha with a narrower hypha apparently enclosed within and the stalks are strongly constricted at the septa.
authors: Department of Plant Biology, University of Illinois, Room 265 Morrill Hall, 505 South Goodwin Avenue, Urbana, Illinois 61801, USA. aferrer@life.uiuc.edu
authors: Astrid
authors: A
authors: Ferrer
authors: Somsak
authors: S
authors: Sivichai
authors: Carol A
authors: CA
authors: Shearer
mesh_terms: D001203:Ascomycota / Q000145:classification* / Q000166:cytology; D005618:Fresh Water / Q000382:microbiology*; D010176:Panama; D013785:Thailand; D014934:Wood / Q000382:microbiology