454 PACIFIC SCIENCE, Vol, VIII, October, 1954 
Fig. 59. a, Herposiphonia tenella: Part of a creeping axis, showing the determinate and indeterminate branches 
and rhizoids, X 63. c, Tolypiocladia glomerulata: h, A terminal portion of an axis, X 24; c, a small portion of an 
axis bearing one of the short, lateral branches with its acute ultimate segments and trichoblasts, X 80. d, e, Bos- 
trychia radicans: d. Habit of a plant extracted from a mat, X 17; part of an erect branch showing the relation 
between the central axial cells and the pericentral cells, X 105. 
reducing P. fragilis Suring. under P. forcipata 
Harv. are not clear to me. 
Polysiphonia subtilissimaMontagne 1840^/ 
199 (French Guiana); Tseng 1944^: 70, pi. 
1; Kiitzing, Tab. Phyc. 13, pi. 28a-e 
Fig. 60c 
LOCAL distribution: Forming dark, dense- 
ly tufted colonies 1.0-1. 5 cm. high at Sta. 6 
(11218). 
These specimens are variable in that some 
possess fairly abundant trichoblasts leaving 
irregularly placed scar cells, while others have 
few or no trichoblasts and scar cells. Such 
plants as the latter agree well with P. sub- 
tilissima as it is recognized by Tseng from 
nearby Hong Kong. The slender proportions, 
40 /X in diameter or less above, the long seg- 
ments, 1.5-2 times as long as broad in mid- 
parts, and the irregular or sparse development 
of trichoblasts are distinctive. 
Polysiphonia tongatensis Harvey, in Kiitz- 
ing 1864, Tab. Phyc. 14, pi. 41 (Friendly 
Islands). Polysiphonia snyderae Kylin (in- 
valid) 1941: 35; Hollenberg 1942^: 784 
Fig. God, e 
