30 : CLADOPHORACEAE 
Cladophoropsis peruviana sp. nov. 
Forming extended and rather rigid mats 2—3 cm. deep; rhizoids 
rare; filaments 1-3 cm. long, commonly unbranched for several 
cells at the báse, then with several clavate mostly one-celled 
branches, then two or three times subdichotomous (rarely trichot- 
omous) near the middle, the main branches subsimple or finally 
wich clavate, mostly one-celled, often secund, suberect, patent, or 
divaricate ramuli, the older branches very commonly septate at 
the base; cells 40-200 и (mostly 80-175 и) in diameter, usually 
6-22 times longer than broad, rather easily separating at the septa 
and occasionally regenerating; cells of the ramuli and of the main 
axes usually of about the same diameter; cell walls in older parts 
5-15 thick. [PLATE 2, FIGURES 1-9.] 
From ап estero near La Palisada (between Tumbes and Capón), 
forming a mat on the mud between the tide-lines, Coker 370 p.p. 
The field notes of the collector describe the color of the plant as 
"green," but the specimens as they come to us are mostly brown. 
The color, the frequent separation of the segments at the septa, 
and the occasional regeneration probably indicate that some of 
the surrounding conditions, possibly a temporary lack of salinity 
of the water, were not especially favorable. In Dr. Coker's 
notes is the following remark: 
“А most striking feature of the aestuary region of Tumbes and 
Сардп was the almost entire absence of seaweeds or aquatic 
grasses. During the greater part of the year there is almost pure 
seawater in all the aestuaries except at the mouth of the Tumbes 
River. After the winter rains, which are expected in February, 
March, or April, the aestuaries are doubtless flooded for a time 
with fresh water. Oysters, clams, and crabs, however, abound.” 
The date for this collection is lacking, but another collection 
in the same vicinity is dated Feb. 2, 1908. 
The existence of complete septa at the bases of the older 
branches in many cases would seem to make it a little doubtful 
whether this plant should be referred to Cladophoropsis or possibly 
to Aegagropila, yet it appears to be most at home with the species 
for which Bórgesen has proposed the generic name С ladophoropsis.* 
Some of the septa which seem at first sight to be complete are 
found upon careful examination to be perforate. 
* Reinbold (Siboga-Exped. Monog. 69a: 78. 1913) e recently discussed irreg- | | 
ularities in the position of the septa in a plant that he has provisionally named 
“ Cladophoropsis paradoxa (?)." 
a a 
