Jania.] 
IX. ALG«. 
681 
subcylindric. — Harv. Ner. Austr. 107 ; J. A g. Sp. Alg. ii, 555. J. tenuissima , 
Sond. ; Harv. 1. c. 106. t. 40. 
Probably common, East coast, Colenso ; Port Cooper, Lyall. (Australia.) 
5. J. no vse- Z elan dise , Harv. in HI. N. Z. ii. 237. Frond 1-2 in. 
long, setaceous, dichotomously branched ; axils acute ; articulations cylindric, 
6-12 times longer than broad. Conceptacles urceolate, axillary, crowned with 
geminate 2-3-articulate filaments. 
East coast, Colenso ; Banks’s Peninsula, Lyall. 
J. gracilis, Lamour., a little-known plant, referred by J. Agardh to J. Cuvieri, is stated 
by Montague to have been found by Hombron at Akaroa. 
52. MELOBESIA, Lamour. 
Frond crustaceous, red pink or whitish, free or attached by its surface, 
never jointed, coated with a calcareous deposit, flattened, orbicular and lobed, 
or cylindric and branched. Conceptacles scattered, conical, sessile, containing 
a tuft of transversely-parted oblong tetraspores. 
Perennial coral-like Alga, found in all seas, sometimes forming calcareous incrustations 
on other Alga, shells, and pebbles, etc., at others erect or foliated. 
1. M. calcarea, Harv. HI. N. Z. ii. 238. Frond shrubby, 2-3 in. 
high, white, subdichotomous ; branches as broad as long, i n - broad, dis- 
tant, lower coalescing, upper free and narrow at the bases. — Harv. Phyc. 
Brit. t. 291 ; Ner. Austr. 110. Lithobia, J. Ag. Sp. Alg. ii. 523. 
Bay of Islands, J. JD. H. (N. Atlantic, Mediterranean Sea, Galapagos Islands.) 
2. M. Patena, Hook.f. and Harv. HI. N. Z. ii. 238. Frond horizontal, 
fixed to the stems of Alga, and by a groove at the base, white red or purplish, 
in. diameter, thick, flat, concave or undulate, obovate or suborbicular, quite 
entire, imbricate, concentrically striate, shining. Conceptacles numerous, 
scattered, depressed. — Harv. Ner. Austr. 111. t. 40. 
Parasitic on Ballia, Colenso. (Tasmania, S. Africa.) 
3. M. antarctica, Hook.f. and Harv. in Harv. Ner. Austr. 111. Frond 
flat, suborbicular, attached by the lower surface ; margins free, quite entire, 
forming a thin expanded irregularly-lobed crust, pale, surface concentrically 
undulate. Conceptacles minute, depressed, hemispherical. — J. Ag. Sp. Alg. 
ii. 514. M. verrucata, var. antarctica, FI. Antarct. 482. 
Iiord Auckland's group, J. D. H. (Tasmania, Puegia, Kerguelen’s Land.) 
53. DELESSERIA, Agardh. 
Frond bright rose-red, leaf-like, simple, dichotomously pinnately or pro- 
liferously branched, very membranous, flaccid ; midrib evident, substance of 
one layer of angular cells. Conceptacles hemispherical, on the ribs or nerves, 
enclosing a tuft of branched filaments bearing spores, which are seated on an 
elevated tubercle on the floor of the cavity. Tetraspores clustered in sori in 
the substance of the frond. 
A most beautiful genus, common in both temperate -zones. » 
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