VOL. 5 | _ West-Coast Porphyras. 69 
constant thickness of the frond 25, which in the latter species, 
in the region of the base, becomes 75”. The species is distin- 
guished from P. zaiadum chiefly by its base, the latter being dis- 
coid and composed of agglutinated, rhizoid-like cells, and also by 
the reproductive bodies. /. adyssicola is moncecious (rarely dice- 
cious):—each sporocarp containing 2-4 carpospores and each 
antheridium containing 8 antherozoids. 
flabitat. On Zostera. 
Distribution. As yet known on the Pacific Coast from but a 
single locality (48° 10’ N. lat.). 
Locality. Whidby Isl., Washington, V. 1. Gardner, No. 273! 
PORPHYRA VARIEGATA Kjellm. in litt. 
Diploderma variegatum Kjellm., Om Beringhafvets Algflora, 
Pp. 33, 1889. 
This species is readily distinguished from all other distromatic 
species of Porphyra by its great thickness (100-220), by the 
great thickness of the jelly-walls, especially those of the vegeta- 
tive cells which are found between the sporocarps, and by the 
variegated appearance of the fertile frond, from which the species 
probably derives its name. The plant is apparently dicecious. 
Each sporocarp contains 32 carpospores. 
Habitat. On rocks. 
Distribution. From Bering Island, Siberia, to Middle Califor- 
nia (55°—36° 45’ N. lat.). 
Localities. Bering Isl., Ajeliman; Coupeville, Washington, 
N. L. Gardner!; Monterey Bay, California, C. ZL. Anderson! C. 
P. Nott! Mrs. J. M. Weeks! 
PORPHYRA OCCIDENTALIS Setchell et Hus MS. 
Fronds membranous, 15-30 cm. long, 1.5-5 cm. broad, linear 
with slightly crenulate margin and a cuneate to orbicular base, 
sessile on small disc; dull red; distromatic, vegetative part of 
frond 45-75». thick, cells square or 1.5-2 times as broad as high, 
12-15 high, 12-3011 broad, surface jelly 10-15 thick; apparently 
diectous, antheridia forming a yellowish margin, measuring 65- 
75 in cross-section; 64 antherozotds in four tiers of 16 antherozoids 
in each antheridium. 
