168 DR. HARVEY ON A COLLECTION OF ALG# 
RHODOSPERME. 
25. Rhodomela larix, Ag.; Harv. Ner. Bor. Amer. ii. p. 24. 
On rocks and drifted, Fuca Strait; Point Roberts; Esquimalt; St. 
Juan de Fuca, Dr. Lyall & C. Wood. 
26. Rhodomela floccosa, Ag. ; Harv. Ner. Bor. Amer. ii. p. 24. 
Fuca Strait and Point Roberts, Dr. Lyall & C. Wood. 
27. RHODOMELA LYALLI, n.sp. Fronde valde compressa elata de- 
composita pinnata disticha, pinnis pinnulisque in ambitu lanceolatis, 
ramulis subulatis alternis brevibus, ceramidiis ovatis subsessilibus 
stichidiisque racemulosis. 
Adrift on the beach, Fuca Strait, Dr. Lyall. 
12-20 inches high, regularly pinnate 3-4 times, all the divisions 
lanceolate (not corymbulose or fastigiate) in outline ; the ramuli 
of the minor pinnules subequal, the lowest not conspicuously 
longer than the rest. In fruit, every ramulus of each ultimate 
plumule is generally converted into either a conceptacle or a stichi- 
dium, without any shortening of the rachis; hence the arrange- 
ment is racemulose, rather than corymboso-fasciculate, by which 
character, together with the larger size, more compressed frond, 
and more regular ramification, this plant differs from R. floccosa. 
28. Odonthalia angustifolia, Suhr. ? 
On the beach, Esquimalt, Dr. Lyall. 
29. Chondria atro-purpurea, Harv. Ner. Bor. Amer. ii. p. 22, t. 18. E. 
Fuca Strait, Dr. Lyall. 
30. Polysiphonia dendroidea, Mont. Syllog. p. 421, No. 1491; FI. Boliv. , 
p. 16, t. 5. f. 1. 
Dredged in 10 fathoms, and cast ashore, Esquimalt, Dr. Lyall. 
Nearly allied to P. parasitica and P. pennata, but more robust. 
31. Polysiphonia atrorubescens, Grev. ; Harv. Ner. Bor. Amer. ii. p. 40; 
Ph. Br. t. 172. 
Esquimalt, and Fuca Strait, dredged in 10 fathoms, and cast ashore, 
Dr. Lyall. 
Var. B. minor. Filis tenuioribus brevioribusque ; Orcas Island, Dr. Lyall. 
39. Polysiphonia Californica, Harv. Ner. Bor. Amer. ii. p. 48. 
Esquimalt, &c., common, Dr. Lyall. 
A very abundant species. The herbarium contains upwards of 
100 specimens of all sizes, from 1 to 10-12 inches high. The 
more pinnated specimens pass, by slight changes, into the follow- 
ing. Perhaps all might be united with P. gemmifera, P. & R. 
33. POLYSIPHONIA CALIFORNICA, var. 8. PLUMIGERA. Filis rigi- 
diusculis distanter ramosis, ramis primariis alternis infra longe nudis 
supra crebre alterne plumuligeris; plumulis bi- tri-pinnatis subfasti- 
