62 West-Coast Porphyras. [ ZOE 
3: 32 spores in each sporocarp 
esc PeiUiy usb Cue ister detatees ercied cues oes cp wee 4 
8 spores in each sporocarp.............. Eee SES Rie eer es ary eee 6 
he BE OCIS oe on A ie coos songs Laie ss oens 
Bo MATONCS: GICECIONS aie... ck pcs sekahes se he A ees P. perforata f. lanceolata. 
5. Fronds brown-purple, 45-150 thick ..,..0..0.cc cic. sesdesssonveees P. perforata. 
Fronds brown-purple, 60,, thick, with thick partition walls................. 
P. perforata f. segregata. 
Fronds red-purple, 25-60,, thick, with thin partition walls................... 
P. Nereocystis. 
Gy PRORGs HibMCMONN Sic 5c ts Seek ap es aie P. leucosticta. 
Fronds dicecious ..... apssie Meme & eT etic es ee P. laciniata. 
. Je Teronos MOncetOus <7. ces ek flaca sechbeveuccueds nabecdl t. eS oer 8 
Posts apparently dicecions 20.6 cc , 10 
8. 16 antherozoids in each antheridium ........ ......ccccceeeeeeees P. amplissima. 
& MUUMETOSOIGS 18 CSCH ANLDCTIC IRE gis. iservicse sh censd cote csr ve © 
Q- Mrotids 25) thick, except at base 3 i.c..i.s.ics cise P. tenuissima. 
SPOTS BO 75 if IGN ic iae cceretvad pica emcees P. miniata f. cuneiformis. — 
10s: FIM 100-2904 THICK Sb sdcceenieces PRR ST pee pre P. variegata. 
BLOUGS 45-750 THUR 25 sss isos ON Gos ee a ee. 
TY. Fronds 25) thick cys. cj, ccdssessscckesless cig-udcesvescecetes ots eee: we EI 
PORPHYRA LACINIATA (Lightf.) Ag. Syst. Alg., p. 190, 1824. 
P. laciniata is distinguished from ?. perforata and from P. 
leucosticta, with which it has frequently been confounded, by the 
thickness of the frond (30-45), by its dicecious (rarely monce- 
cious) character, and by the number of reproductive bodies:— 
each sporocarp containing 8 (or 16) carpospores and each an- 
theridium containing 64 (or 128) antherozoids. 
Habitat. On rocks, or epiphytic on Fucus evanescens. 
Throughout the litoral and upper sublitoral zones. 
Distribution. What the author believes to be the P. /acin- 
tata of European authors, appears, as far as can be judged 
from collections examined, to be limited to the shores of Alaska 
(61°-54° N. lat.). 
Localities. Orca, Alaska, W. A. Setchell No. 5164/; Vakutat, 
Alaska, Rev. Albin Johnson No. 14/; Uyak Bay, Kadiak Isl., 
Alaska, W. A. Setchell No. 5099/; Amaknak Isl., Alaska, WW. A. 
Setchell No. 3270! No. 3269! 
PORPHYRA LACINIATA F, UMBILICALIS Ag., Icones Alg., Tab. 
26, 1828. 
