Cystoseira geminata C.Agardh

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AB UNIVERSITATE BRITANNICO-COLUMBIANA EDITAE
Series — ALGAE	Fasciculus I
9. HETEROCHORD ARIA ABIETIN A (Ruprecht) Setchell and
Gardner, 1924: 6.
SYN.: Chordaria abietina Ruprecht, in Farlow, 1876, p. 357.
On rocks in the lower intertidal zone. Turn Point on San Juan
Island, Washington, U.S.A. (Lat. 48°32'N. Long. 122°59'W.).
DESCRIPTION: Thallus comprising a basal disc giving rise to several
erect shoots from 5-50 cm. high. The erect shoots with a percurrent cylin-
drical axis thickly covered on. all sides with radiating, slightly flattened
branchlets from 1-5 cm. long. Colour varying from a light yellowish brown
to a dark olive brown.
LEG.: Robert F. Scagel, 18 June 1955 (No. 11).
DET.: Robert F. Scagel.	NEW YO
BOTANICA
GARDEN
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AB UNIVERSITATE BRITANNICO-COLUMBIANA EDITAE
Series — ALGAE	Fasciculus I
11.	CYSTOSEIRA GEMINATA C. Agardh, 1824: 286.
SYN.'.Cystoseira thyrsigera Postels and Ruprecht, 1840, p. 13, pi. 38,
fig. 1; Cystophyllum geminatum (C. Agardh) J. Agardh, 1848, p.
2S2;Cystoseira lepidium Harvey, 1862, p. 163.
On rocks in the lower intertidal and upper subtidal zones. Goose
Island, at the south entrance to San Juan Channel, Washington,
U.S.A. (Lat. 48°27'N. Long. 122°57'W.).
DESCRIPTION: Thallus erect, 1-3 m. high, attached by a conical disc.
The basal part comprises a stout stipe from 0.5-1.0 cm. in diameter from
which arise numerous branches. At first the branches are filiform, becom-
ing spatulate near the base, later and in the distal portions becoming
shorter and terminating in fusiform air vesicles and swollen receptacles.
The vesicles are produced singly or in groups of 2 or 3 with the terminal
one on the branch apiculate. Colour olive brown to brownish black.
LEG.: Robert F. Scagel, 21 June 1955 (No. 14).	vnDi^
DET, Robert F. Scagel.	NEW YORK
PLANTAE EXSICCATAE
AB UNIVERSITATE BRITANNICO-COLUMBIANA EDITAE
Series — ALGAE	Fasciculus I
12.	RHODYMENIA PERTUSA (Postels and Ruprecht) J. Agardh,
1852: 376.
SYN.: Porphyra pertusa Postels and Ruprecht, 1840, p. 20, pi. 36.
Rhodymenia wilkesii Harvey and Bailey, 1851, p. 371.
On rocks in the upper subtidal zone to a depth of 5 fathoms. At the
south end of Shaw Island, near Canoe Island, Washington, U.S.A.
(Lat. 48°34'N. Long. 122°55'W.).
DESCRIPTION: Thallus erect, flattened, blade-like from 0.5-1.5 m. high
when mature and perforated with numerous holes; with a short terete to
slightly flattened stipe arising from a discoid holdfast. Frequently with
several blades arising from the same holdfast. Colour a rose red to brownish
red.
LEG.: Robert F. Scagel, 27 June 1955 (No. 15).
DET.: Robert F. Scagel.
NEW YOR
botanica
garden
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