Entophlyctis apiculata, a chytrid parasite of Chlamydomonas sp. (Chlorophyceae)
A chytridialean fungus identified as Entophlyctis apiculata (Braun) Fischer parasitized cells of Chlamydomonas sp. that bloomed in an agricultural pond in Hongsung, Korea, during 1999 and 2000. This is one of the species for which Fischer described the genus Entophlyctis in 1892. Since the segregation of the Spizellomycetales from the Chytridiales confusion has existed as to whether Entophlyctis is a spizellomycetalean or a chytridialean genus. We examined the morphology and development of the Korean E. apiculata with light and transmission electron microscopy. The parasite develops exogenously and has a monocentric, inoperculate zoosporangium. Zoospores within the sporangium contain a single lipid globule associated with a microbody, a rumposome, and a nonflagellated centriole that is parallel and attached by fibers to the kinetosome. These features indicate that E. apiculata is a member of the Chytridiales; however, zoospores were still within the zoosporangium and did not provide sufficient characters to determine the zoospore subtype, which is important for identifying clades within this order.Key words: Chytridiales, pond, Spizellomycetales, ultrastructure, zoospore.