The Cladochytriales (4), like the Chytridiales, has several different genera with a mix of polycentric, monocentric, operculate, and inoperculate members that were traditionally separated on the basis of operculation, thallus morphology, and development (1 - 4). Due to sequence data, these genera have been placed together but it is not yet known what morphological and/or ultrastructural characters may be equally useful in defining the group as a whole. Also, more ultrastructural work needs to be done to fill in gaps on genera that have not been examined, such as Endochytrium and Septochytrium. The zoospore subtype is defined based on the Nowakowskiella zoospore (3).
- (1) Barr, D. J. S. 1986. Allochytridium expandens rediscovered: morphology, physiology, and zoospore ultrastructure. Mycologia 78: 439-448.
- (2) Barr, D. J. S., Desaulniers, N. L., and Knox, J. S. 1987. Catenochytridium hemicystii n. sp. morphology, physiology, and zoospore ultrastructure. Mycologia 79: 587-594.
- (3) Lucarotti, C. J. 1981. Zoopore ultrastructure of Nowakowskiella elegans and Cladochytrium replicatum (Chytridiales). Can. J. Bot. 59:137-148.
- (4) Mozley-Standridge, S.E., P.M. Letcher, J.E. Longcore, D. Porter, and D. R. Simmons. 2009. Cladochytriales - a new order in Chytridiomycota. Mycological Research 113: 498-507.
- (5) Steiger, R.A., D.R. Simmons, and J.E. Longcore. 2011. Cylindrochytridium johnstonii is a member of the Cladochytriales. Mycotaxon 118: 293-302.