Var. fronde simpliciuscula iutestinæformi.—Earv. Alg. Exsic. n. 89.
H a b . Georgetown, B. Gunn, JF. E . E .
D i s t r ib . South coasts of New Holland.
Frond 6 inches to a foot or more in heiglit, from 2-4 lines in diameter, or sometimes upwards of half an incli
across the swollen branches, very m-egiilar in ramification, sometimes nearly simple, sometimes much branched. In
the simpler varieties the branches are often much swollen. The substance ia firmly carnoso-gelatinous and tongh,
and the colour a dark-brown, becoming blackish when dry. The axial filaments are very dense, those of the periphery
remarkably slender, elongated, several times dichotomous, and perfeetly cylindrical, their joints three or four
times as long as broad. The spores are obovate, with a wide perispem, and are borae near the bases of the peripheric
filaments.—We are not sm-e whether this species be correctly referable to Liebmannia, where we place it on
account of the dense axis.
Gen. XXIX. MESOGLOIA, Ag.
(J. Ag. Sp. Alg. i. p. 56. Kütz. Sp. Alg. p. 544. Haiv. Phyc. Brit. t. 31, 82.)
1. M e so g lo ia v ir e sc en s (Carm.; Harv. Phyc. Brit. t. 8 2 j J. Ag. Sp. Alg. i. p. 56).
H a b . Georgetown, R. Gunn.
D i s t r ib . Atlantic shores of Europe, Gulf of Mexico, south coast of New Holland, and at the Friendly
Islands. (Vavau, JF. H. E .)
Gen. XXX. CLADOSIPHON, Eüiz.
(Kütz. Phyc. Gen. p. 329. t. 25. f. 1. J. Ag. Sp. Alg. i. p. 54. Kütz. Sp. Alg. p. 547.)
1. Cladosiphon Chordaria (Harv.) ; caule indiviso percurrente, ramis lateralibus longissimis quo-
quoversis simplicibus v. subdichotomis, ramulis paucis, axillis obtusis, filis periphericis simplicibus brevissimis
clavatis unicellularibus, sporis ellipticis.—Æa?-u. Alg. Exsic. n. 95, 96 ; P/iyc. Austr. t. 60.
Yar. 0 . Bictyosiphon ; fronde minori densius ramosa, ramis ramulis plus minus obsitis.— C. Dictyo-
siphon, Earv. Alg. Exsic. n. 97.
H a b . Georgetown.
D i s t r i b . South coast of Austraha.
Frond a foot or more in height, and as much in the expansion of the branches. Stem mostly simple, densely
clothed thi'oughout with long lateral branches which issue in all directions. Branches filiform, varying iu diameter
from the thickness of a hog’s-bristle to a line ; in the former cose of equal diameter throughout, in the latter tapering
at each end, simple and bare of ramuli, or once or twice forked, or, in var. /?, furnished with numerons short
patent ramuli. In young spechnens the central cavity is narrow, in more advanced it gradually widens, the frond
becoming somewliat inflated. The walls of the tube are composed of several rows of longitudinal filaments, densely
aggi-egated into a fiimly cellular flesh ; the peripherj' is formed of minute, radiating, simple filaments, each formed
of a single clavate cell, issuing from the cells of the outer row of those composing the tube-waU. Elliptical spores
nestle among the filaments of the periphery.—The Georgetown specimens are of much greater diameter than those
from Port Phillip, on which the species was founded. This seems to arise from an increase in diameter of the central
tube. I cannot detect any difference in microscopic character, and therefore have brought them together, and
also reduce to the same my C. Biclyosiphon, which, from its difference in habit, I had previously distributed as
distinct.
2. Cladosiphon n igr icans (Harv.) ; fronde filiformi longissima subsimplici v. parum ramosa, ramis
lateralibus paucis vermiformibus elongatis nudis v. ramulos paucissimos ferentibus, tubo frondis demum
amplo, filis periphericis fascicukto-ramosis longiusculis articulatis, articuhs diametro sesquilongioribus
terminali globoso.— Harv. Alg. Exsic. n. 94.
H a b . Georgetown, R. Gunn, JF. E . E . (Often on Zostera.)
D i s t r ib . Western Port, Victoria, JF. E . E .
Frond 1-2 feet long, simple, with a few lateral simple branches, each several inches or upwards of a foot in
length, and either quite naked or furnished with a few distant lesser branches ÜTegularly distributed. The waüs of
the frond are composed of three or four rows of longitudinal, closely agglutinated filaments. At fust the cavity is
small, but finally it widens. The peripheric filaments are subfasciculate, irregularly forked or laterally branched ;
their articidations are eylindrical, and longer than their diameter ; the terminal cell is globose, and of larger diameter
than the rest, so that each fibre is capitate.—After having been dried, tbe tube in some cases remains permanently
collapsed, but in others it fi-eely opens, a difference perhaps depending on maturity.
Gen. XXXI. LEATHESIA, S. P. Gray.
(Gray, Br. PI. i. p. 301. Endl. 3rd Suppl. p. 23. Harv. Phyc. Brit. t. 176. J. Ag. Sp. Alg. i. p. 50.
Kütz. Sp. Alg. p. 543.)
1. L ea th esia tuberiformis (S. F. Gray, Br. PI. i. p. 301 ; Harv. Phyc. Brit. t. 324).—L. marina,
Endl. 3rd Suppl. p . 2 3 ; Kiitz. Sp. Alg. p . 543; J. Ag. Sp. Alg. i. p . 52. Eivularia tuberiformis, Eng.
Bot. t. 1956.
H a b . Rocks : at the mouth of the Tamar, etc.
D i s t r ib . Atlantic shores of Europe and America, Cape of Good Hope, south coast of New Holland.
Gen. XXXII. MYRIONEMA, Grev.
(Grev. Crj-pt. Fl. t. 300. Endl. 3rd Suppl. p. 23. J. Ag. Sp. Alg. i. p. 47.)
1. Myrionema Leclancherii (Chauv.; Harv. Phyc. Brit. t. 41 A ; J . Ag. Sp. Alg. i. p. 48).—
Phyllactidium maeiilæfotme ?, Kiitz. Phyc. p. 295.
H a b . On TJlvoe : at Georgetown ; parasitic.
D i s t r ib . Atlantic shores of Europe, etc.
Gen. XX X III. CLADOSTEPHUS, Ag.
(J. Ag. Sp. Alg. i. p. 41. Harv. Phyc. Brit. t. 33. 138. Kütz. Sp. Mg. p. 468.)
1. Cladostephus sp ongiosus (Ag. Sp. p. 12; Harv. Phyc. Brit. t. 138; Hook. fil. Fl. Antarct.
p. 1C3; J . Ag. Sp. Alg. i. p. 43).
I I a b . Tasmania, C. Stuart.
D is te ib . A native of Europe, North and South America, and of the south coasts of Austraha, etc.
T r ib e VI. ECTOCARPACEÆ.
Gen. XXXIV. SPHACELAEIA, Lyngb.
(Lyngb. Ilyd. Dan. p. 103. J. Ag. Sp. Alg. i. p. 29.)
1. S pbacelaria paniculata (Siilir; J . Ag. Sp. Alg. i. p. 36).—S. hordeacea, Earv. in Hook. Ic.
PI. t. 614. Stypocaulon paniculatum, hordeaceum, et virgatum, Kiitz.
H ab. Coast rocks, common : Georgetown, Port Arthur.
D i s t r ib . Coasts of New HoUand and New Zealand, Cape of Good Hope.