290 FLORA OF TASMANIA. [Alye, by W. H. Harvey. 
Has. Sea-shores. 
Disrris. Shores of New Holland, New Zealand, Chili, Cape of Good Hope, and Canary Islands. 
The less or greater length of rachis, and the absence or presence of spines on the surface of the frond, charac- 
ters which distinguish the E radiata and E exasperata of Agardh from each other, are certainly variable, and we 
think we have satisfactorily traced one form into the other. Noris E Richardiana a more satisfactory species. 
Gen. XXI. CHORDA, Stackh. 
(Lamour. Ess. p. 26. Lyngb. Hyd. Dan. p. 72. Grev. Alg. Brit. p. 46. Harv. Phyc. Brit. t. 107, 285. Kiitz. 
Sp. Alg. p. 548. Scytosiphon, Endl. 3rd Suppl. p. 25. J. Ag. Sp. Alg. i. p. 125.) 
1. Chorda lomentaria (Lyngb. Hyd. Dan. p. 74. t. 18; Harv. Phyc. Brit. t. 285).—Scytosiphon 
lomentarium, J. Ag. Sp. Alg. i. p. 126. 
Haz. Georgetown, Gunn, ete. Southport, C. Stuart. 
DisrRis. Native of the Atlantic and Pacific, in the northern and southern temperate zones, and of 
the Antarctic Sea. 
Gen. XXII. ADENOCYSTIS, Hook. fil. et Harv. 
(Fl. Antarct. i. p. 179. J. Ag. Sp. Alg. i.p. 124. Chorde sp., Kütz.) 
l. Adenocystis Lessonii (Hook. fil. e& Harv. Fl. Antarct. i. p. 179; J. Ag. Sp. Alg. i. p. 124). 
—Asperococcus Lessonii, Bory, Cog. t. 11. f. 9. Chorda pas Kütz. Sp. Alg. p. 549. 
Has. Tide-pools at Port Arthur, W. H. H. 
DistrIB. Antarctic shores, New Zealand. 
TarsE IV. DICTYOTACEA. 
Gen. XXIII. HALYSERIS, Zargion. 
(Targion. MS. Ag. Sp. i.p. 141. Grev. Alg. Brit. p. 63. Endl. 3rd Suppl. p. 24. Harv. Phyc. Brit. t. 19. 
Kütz. Phyc. p. 340. J. Ag. Sp. Alg. i. p. 114. Kütz. Sp. Alg. p. 561.) 
l. Halyseris Muelleri (Sond.); stipite elongato ramoso, fronde dichotoma v. suppressione ramo- 
rum alterne ramosa, sinubus obtusiusculis, segmentis erectis latis linearibus integerrimis swpe alterne 
divisis, lamina crassiuscula enervi, antheridiis sparsis.—Harv. Alg. W. Austr. in Trans. R. I. A. xxii. 
p.995. H. polypodioides, Harv. in Lond. Journ. Bot, vi. p. 415. 
Haz. Georgetown, ete., common. 
Disrris. Abundant along the western and southern coasts of Australia. 
Gen. XXIV. ZONARIA, J. 49. 
(J. Ag. Linnea, xv. p. 444. Endl. 3rd Suppl. p. 25. J. Ag. Sp. Alg. i. p.106. Stypopodii sp., et Phycopteris, 
Kütz. Sp. Alg. 563, 564.) 
l. Zonaria interrupta (Ag.; J. Sy hec Alg. i. p. 111).—Phycopteris interrupta, Kútz. Sp. Alg. 
p. 564. Fucus interruptus, Zurn. Hist. t. 2 
Has. Georgetown, R. Gunn, etc. 
Gen. XXV. DICTYOTA, Zamour. 
(J. Ag. Sp. Alg. i. p. 86. Kiitz. Sp. Alg. p. 558. Harv. Phyc. Brit. t. 103.) 
l. Dictyota fastigiata (Sond. Bot. Zeit. 1845, p. 50; J. Ag. Sp. Alg. i. p. 100). 
