ECTOCARPACEAE 47 
PHAEOPHYCEAE 
Family ECTOCARPACEAE 
STREBLONEMA Derb. & Sol. in Cast. Suppl. Cat. 
Pl. Marseille 100. 1851 
Streblonema radians sp. nov. 
Endophytic and amphigenous, scarcely exserted, forming sub- 
orbicular dark green patches mostly 5-20 mm. in diameter, the 
older becoming lighter-colored in the center as the margins 
advance; filaments in the medulla of the host sparingly branched, 
4.5-9 и broad, the cells usually 2-10 times longer than broad, the 
surface-seeking branches subsimple or with fastigiate ramuli, 
three ramuli occasionally arising from a single cell; chromato- 
phores 1-6, oblong, subcuneate, or somewhat discoid, often (espe- 
cially towards the surface) confluent or single; hairs wanting (or 
very rare?); plurilocular sporangia simple or sometimes branched, 
short-cylindric, or ovoid, mostly 11—15 и long and 4-6 и broad, 
consisting of 1-6 (usually 3-5) discoid, subspheric, or sub- 
quadrate cells (2—4.5 и high) in a single series, the distal ends of the 
sporangia even with those of the peripheral filaments of the host 
plant or slightly protruding; unilocular sporangia unknown. 
[PLATE 6, FIGURE B; PLATE II, FIGURES 8-13. 
Forming conspicuous dark patches in Grateloupia Сийетае 
procera, occupying the medulla of its host and reaching both 
surfaces about equally; water-front of Callao, Dec. 27, 1906, 
Coker 17 p.p. (type); also оп same host (Coker 37) from La 
Punta, in the same general locality. 
The species is possibly close to Streblonema tenuissimum Hauck, 
described as occurring "zwischen den Rindenfáden von Nemalion 
lubricum im adriatischen Meere," but we infer from Hauck's brief 
description that the Peruvian plant on Grateloupia is quite different 
in habit and that its very short, reduced, sometimes branched, 
plurilocular sporangia are different from the somewhat thicker 
"fadenfórmig" sporangia of S. tenuissimum. Streblonema minu- 
tissimum Saunders (Proc. Washington Acad. Sci. 3: 416. pl. 45. f. 3. 
1901) in Liebmannia from Sitka, Alaska, has vegetative filaments 
that are only 1-2 шіп diameter and its plurilocular sporangia are 
more differentiated, more pointed, and are twice as long. Streblo- 
пета minutulum Heyd. (Ber. Deuts. Bot. Ges. то: 471. pl. 26. f. 
