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L925] Setrhcll Gardner: Melcmophycew 579
exactly the nature of Ruprecht's Aspe.rococcus Cystoseircu and its
relation to the Japanese plant on the one hand and the Alaskan plant
on the other. Rupreeht states that the type of A. Cystosevrae is para-
sitic on Cystoseira Lepidmm hut not on ('. thyrsigera.
Key to the Species
1. Fronds complanate from the beginning, rigid, membrane up to .*^7o/u thick,
epiphytic, stipe short 6. C. rigida (p. 584)
1. Fronds inflated at first, collapsing, especially when ruptured, membrane less
than 250^ thick 2
2. Fronds ample, up to more than 1 m. long, and 1 dm. broad, epiphytic,
stipe short 1. C. californica (p. 579)
2. Fronds smaller in all proportions 3
3. Fronds narrowly cylindrical, up to 8 mm. diam., and 8 dm. long, epiphytic,
stipe short 5. C. Cystoseirae (p. 583)
3. Fronds more or less irregular, subcylindrical 4
4. Fronds finely corrugated, subsessile, epiphytic, stipe short
3. C. corrugata (p. 582)
4. Fronds undulate, decidedly stipitate 5
5. Fronds saccate, slightly undulate, saxicolous, stipe slender, elongated
2. C. bulligera (p. 581)
5. Fronds flattened, decidedly bullose, with ruffled margins, saxicolous, stipe
slender, elongated 4. C. polygnampta (p. 582)
5. Fronds moderately bullose, epiphytic, stipe slender 7. C. sitchensis (p. 584)
1. Coilodesme californica (Rupr.) Kjellm.
Plate 46, figs. 1, 2, and plate 86
Fronds flabby and fragile, smooth when young, more or less
wrinkled, or bullate, and ruffled along the margins at maturity, inflated
in the juvenile stage, soon collapsing because of ruptures, usually at
the apex, chiefly cylindrical, rounded above, tapering rather abruptly
at the base to a very short stipe 1-2 mm. long, variable in size from a
few decimeters to over a meter long, up to 12 cm. wide, 175 to 215/x
thick, composed of an inner tissue of 4-5 layers of large, colorless cells
intermixed with smaller cells, and a cortical tissue of cells in anti-
clinal rows, 2-4 cells in a row ; zoosporangia very irregular in form
and size, 40-45/* long; color light brown, changing to greenish on
exposure.
Epiphytic on Cystoseira and Cystophyllum. Puget Sound region
to southern California (San Pedro).
Kjellman, Undersok. Slagtet Adenoeystis, 1889a., pp. 4-8, figs. 1-8
(excl. specimen) ; Saunders, Phyc. Mem., 1898, p. 160, pi. 29, figs. 1-3,
Alg. Harriman Exp. 1901, p. 422; Setchell and Gardner, Alg. N.W.
Amer., 1903, p. 241; Collins, Mar. Alg. Vancouver Isl., 1913. p. 106;