RHODOSPERMES®. 109 
forming one of those lovely combinations of colour in rock pools which 
algologists love to gaze on. The capsules of this species are seated on the 
Fic. 102. Polysyphonia nigrescens, 
sides of the branches and ramuli, as seen in a magnified branch at a, 
Fig. 105. Tetraspores are formed in the joints of terminal ramuli, as 
Fie. 103. Polysiphonia fibrata; (a) Ramulus with tetraspores; (b) Ovate capsules 
with spores; {c) Magnified branchlet with antheridia. 
represented at 6, Fig. 105, which is a more highly magnified branchlet 
of the beautiful variety of this plant, known hitherto as P. formosa. This 
