What are These Chytrids?
Barr (1) delineated the order Spizellomycetales from the Chytridiales based on distinctive zoospore ultrastructure. Rhizophlyctis rosea was included in this new order, but recent ultrastructural and molecular analyses demonstrate that R. rosea is a morphogenus distinct from the Spizellomycetales (2). As a consequence a new order has been established which includes four families and four genera, each with distinctive zoospore ultrastructure (2, 3).
Current systematic synthesis of the order Rhizophlyctidales:
The Order Rhizophlyctidales (2) includes four genera:
These Chytrids are Found in Diverse Habitats:
Rhizophlyctidalean chytrids are common in the soil worldwide (2).
(1) Barr, D. J. S. 1980. An outline for the reclassification of the Chytridiales, and for a new order, the Spizellomycetales. Canadian Journal of Botany 58, 2380–2394.
(2) Letcher, P.M., M. J. Powell, Donald J. S. Barr, Perry F. Churchill, William S. Wakefield, and Kathryn T. Picard. 2008. Rhizophlyctidales is a new order in Chytridiomycota. Mycological Research 112: 1031-1048.
(3) Davis, W.J., P. M. Letcher, M. J. Powell. 2016. Borealophlyctis nickersoniae, a new species in Rhizophlyctidales. Mycologia 108: 744-732.