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HALYMENIA p u r p u r a s c e n s ; v a r . c r is p a t a .
Purple cylindrical Halymenia ; curled variety.
C la s s a n d O r d e r CRYPTOGAMIA ALGÆ, ii™.—N a t . O r d . ALGÆ, Juss.
G EN ERIC CHARACTER.
Frons plana vel tubulosa, submembranacea. Fructus: tubercula punctifcyrmia la-
mince frons subimmersa— A g a r d h .
Frond plane or tubular, somewhat membranaceous. Fructification: punc-
tiform tubercles subimmersed in the sui-face.
S P E C IF IC CHARACTER.
H a lym en ia purpurascens ; fronde membranacea flifw m i, tubulosa, subpinnala
vel vagè ramosa, ramis elongatis, fastigiatis simpliciusculis, basi attenuatis.
H. Frond membranaceous, filiform, tubular, somewhat pinnate or irregularly
branched, the branches elongated, fastigiate, mostly simple, attenuated
at the base.
H a l y m e n ia ? purpurascens, Ag. Sp. Alg. 1. p. 220.—Grev. Alg. Brit. Fxs.
No. 16.
H a lym en ia filifo rm is, Ag. Syst. Alg. p . 245.
C h o n d r ia p u rp u r a s c e n s , Grev. FI. Fdin. p. 200.
G a s t r id igm filiforme, Lyngb. Hydroph. p. 68. t. 17-—FI. Dan. t. 1664.
U lva purpurascens, Huds. FL Angl. p. 56g— With. Bot. Arr. ed. 6. v. 4.
p. 153.—Hull, Brit. FI. p. 312.—Woodm. Trans. Soc. Linn. v. 3. p. 52.—
Smith, Engl Bot. t. 641. ( non Gastridium purpurascens, Lyngb.)
U l v a ? purpurascens. Hook. FI. Scot. Pt. 2. p. Q2.
U lva incrassata, FI. Dan. t. 653.—Ag. Syn. p. 47.
U lva spongiformis, FI. Dan. t. 763. f. 2.—Ag. Syn. p. 47.
U lva filiformis, FI. Dan. t. 1480. f. 2.—Wahl. FL Lapp. p. 508. (non Hud-
soni nec Witheringii.)
U lva contorta, De Cand. FI. Franç. v. 2. p. 10. ?—Fjusd. Syn. p. 5.?
Fu cu s contortus, Gmel. Hist. Fuc. p. 181. t. 22. f. ].?
H ab. Attached to rocks and stones in the sea. F rith of Forth, abundantly.
The variety figured, occurs opposite Seafield Baths, Leith. The species
is also found on most of the British coasts. Summer.
Boot minute, scutate. Fronds growing several from the same base, branched,
3-9 inches in length or more, mostly one to two-eighths of an inch
in thickness, cylindrical, flexuose, attenuated at the base, and often also
towards the extremities, continuous, smooth, membranaceous, gelatinous
within, somewhat transparent, varying in colour from pale yellowish-red
to dark reddish-purple ; the branches are rather few, distant, spreading,
generally simple, elongated, always attenuated at the base, often at
the extremity, occasionally arising from near the bottom, but usually to-
YOL. IV.
240
/