Pliloma.] 
IX. ALGjE. 
679 
diate tissue of rounded-angular cells ; cortical cells rounded, minute. Con- 
ceptacles subterminal on the pinnules. 
A genus of a single most beautiful species. 
1. P. magellanica, J. Ag. Sp. Alg. ii. 774 ; — FI. N. Z. ii. 235. Foot 
scutate. Frond 2-10 in. long, in. broad, membranous above, cartilagi- 
nous below ; pinnae alternate or subopposite in pairs, terminal flattened, 
toothed ; teeth growing out into linear pinnae ; axils rounded. — Plocantium, 
Hook. f. and Harv. El. Antarct. ; Harv. Ner. Austr. 124. Thamnophora , 
Mont, in Yoy. au Pole Sud,'t. 8. f. 2. 
East coast, Lyall. (Abundant in Fuegia and Kerguelen’s Land.) 
49. AMPHXROA, Lamouroux. 
Frond pale-red, flat, compressed or terete, articulate, dichotomously branched 
or pinnate or whorled ; articulations cartilaginous, coated with calcareous 
matter. Coneeptacles conical, wart-like, opening by a pore, enclosing a tuft 
of erect pyriform, at length 4-parted spore-threads. 
Handsome Corallines, usually found in tide-pools in both temperate, but chiefly tropical 
seas. 
1. A. corymbosa, Decaisne ; — FI. N. Z. ii. 237. Frond 4-5 in. high, 
densely tufted, 2-pinnate at the top ; pinnae and pinnules close-set ; lower 
articulations cylindric, very short ; intermediate and upper deltoid or ob- 
cordate, compressed ; lateral angles acute or produced, of the branches sub- 
sagittate ; terminal lanceolate. — Harv. Ner. Austr. 99. t. 38; J. Ag. Sp. 
Alg. ii. 550. 
East coast, Colenso • Bay of Islands, Lyall, etc. (S. Africa.) 
2. A. elegans, Hook. f. and Harv. FI. N. Z. ii. 237. Frond 2-3 in. 
long, slender, irregularly dichotomous ; forks distant ; lower articulations 
terete, three times as long as broad ; middle and upper sagittate, with acute, 
subulate, erecto-patent, obtuse lobes. Coneeptacles sunk in the lobes of the 
articulations. — Harv. Ner. Austr. 101. t. 38 ; J. Ag. Sp. Alg. ii. 546. 
Cape Kidnapper, Colenso. (Tasmania.) 
50. CORALLINA, Linnaeus. 
Frond pale pink, filiform, jointed, usually pinnately branched ; articula- 
tions coated with a calcareous deposit. Coneeptacles ovoid-turbinate or ob- 
ovate, opening by a pore, containing a tuft of erect pyriform or clavate 
transversely-parted tetraspores. 
Small tufted perennial calcareous Alga, known as Corallines, and growing in all seas. 
1. C. armata, Hook. f. and Harv. FI. N. Z. ii. 237. Frond dull 
purple, short, stout, 1-2 in. high, simple below, flabellately branched at the 
summit ; branches 2-pinnate, fastigiate ; articulations of the stem short, 
crowned with spines, middle broadly obcuneate, compressed, short, with 2-6- 
