Monographs Details: Radaisia
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Family:Hydrococcaceae
Scientific Name:Radaisia
Description:Species Description - Thallus very variable in shape and size, 30-40 n thick; early stages in the development unknown; erect filaments more or less branched and coalesced, irregular in diam., composed of cells 3.575 M diam., one-half to one-third as long as the diam.; color purplish violet; gonidangia terminal, simple.

Distribution and Ecology - Growing on stones in company with several other species of Myxophyceae in a brook west of Humacao, no. 593, type.

Discussion:

It is very difficult to make out the limits and character of the basal portion of this species because of the presence of other encrusting Myxophyceae, e.g., Xenococcus, with which it has to compete for space.