Abstract
The alga described herein was collected from a tank in Jodhpur, India. It has a number of uniseriate, palmelloid cells embedded in thick mucilage. Filaments tend to lie intertwined in pairs, forming a pseudoparenchymatous expanse. The cells are spherical to subspherical with a parietal chloroplast, almost covering the entire wall. The cells measure 5·8–8·5 μm in diameter. Although uniseriate initially they can divide and come to lie in a biseriate manner also. The mucilage sheath is thick and homogeneous at first and is 9–15 μm broad. It assumes various transverse thickenings and in later stages of development shows caplike structures. Profuse zoospore formation also occurs in which all cells participate. Each cell metamorphoses into a single zoospore which is spherical to subspherical, measures 5·8–8·5 μm in diameter and has two, equal, anterior flagella. The zoospores escape, swim for several hours and then form palmelloid masses. Sexual reproduction has not been observed. This alga shows characters close to Tetrasporales, but has the essential features of Ulotrichales.
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