182 DELESSERIACEAE 
p.p., attached to Rhodymenia flabellifolia; attached to Corallina 
officinalis on surf-washed rocks, Chincha Islands, June 18, 1907, 
Coker 192 p.p.; in one fathom, Isla Vieja, Bahía de la Inde- 
pendencia, July 20, 1907, Coker 09640 p.p.; from the drift on the 
beach, Pisco, July 7, 1908, Coker 465 р.р. [PLATE 54.] | 
Like several other species of Peruvian algae secured Бу Dr. 
Coker, Nitophyllum cryptoneuron seems to have been known hither- 
to from the original specimens only, so far as we are able to deter- 
mine from published records. The type of the species, collected 
at Callao by d'Orbigny, is preserved in the Muséum d'Histoire ` | 
Naturelle іп Paris and we owe a photograph of it to the courtesy 
of Professor Mangin and M. Hariot. Although described with 
much detail by Montagne, the species, like the following, was ` 
apparently overlooked by J. Agardh in his monograph of the 
genus (Sp. Alg. 3% 17-98. 1898). De-Toni (Syll. Alg. 4: 666. ` 
1900) gives an abridged description of it and places it among his 
“Species minus notae aut quoad sectionem incertae.” Іп ош 
opinion the species is a valid one and should be placed not far 
from the Californian N. Fryeanum Harv., which was described 
one year later. 
АП of the material collected by Dr. Coker appears to be sterile - 
or antheridial. The “maculis pallidis oblongo-rotundis" of 
Montagne are manifestly the antheridial sori or the places that | 
have been occupied by them, as was suspected by him. Parts 
of the thallus, in its younger stages at least, are prostrate ог de- | 
cumbent and bear on the ventral surface numerous multicellular 
hapteres, which are at first dome-shaped and afterwards elongate- 
cylindric with a distal expansion. The basal parts of the erect 
thallus are 50-160 и (2-8 cells) thick, but the upper and chief | 
portion of the thallus is 50-115 и thick and more or less unistratose. | 
In a cross section of the thallus the cells in the monostromatic 
parts appear somewhat columnar, being mostly 2-3 times as high 
as broad. The numerous slender anastomosing veinlets arè- 
usually only one cell broad; they are, however, very distinct. 
under a compound microscope in fluid-preserved material, but - 
are often obscure when dried material is soaked out. Ш size | 
and general habit the plants suggest certain forms of N. laceratum | 
and of the Californian М. violaceum. t is possible that the 
