Alge, by W. H. Harvey.) FLORA OF TASMANIA. 311 
of both surfaces a deep dull-red. Conceptacles hemispherical, several closely clustered together near the tops of 
the branches. : ; 
This appears to be a distinctly-marked species. 
Gen. LXIII. MELOBESIA, Lamour. 
(Lamour. Cor. Flex. p. 313. Harv. Ner. Austr. p. 109.—Melobesia et Lithothamnion, Auct. 
Aresch. in J. Ag. Sp. Alg. ii. p. 519.) 
Several forms (we can hardly call them species) referable to this group occur on the rocky coasts, but they 
have not yet been carefully collected. The minute kinds, M. membranacea, M. farinosa, M. verrucata, M. pustulata, 
and M. Patena, are parasitical on several Alge, on Zostera, etc. 
Trise V. SPHEROCOCCOIDEE. 
Gen. LXIV. DELESSERIA, Lamour. 
(Grev. Alg. Brit. p. 71. Harv. Ner. Austr. p. 114. J. Ag. Sp. Alg. ii. p. 677.—Hemineura, Harv. 
Ner. Austr. p. 116. FI. N. Zeal. p. 240.) 
1. Delesseria Lyallii (Hook. fil. et Harv.; Fl. Ant. ii. p. 471. t. 176; J. Ag. Sp. Alg. ii. 
p. 693; Harv. Ner. Austr. p. 114). 
Has. In the Tamar, especially at Point Rapid. 
Disrris. Falkland Islands and Kerguelen’s Land. 
2. Delesseria Tasmanica (F. Muell.); fronde costata foliis a costa prorumpentibus ramosa, 
foliolis lineari-oblongis basi et apice obtusis venis pellucidis a costa pinnatim abeuntibus notatis, cysto- 
carpiis sorisque tetrasporarum in sporophyllis propriis a costa exeuntibus evolutis. (Tas. CXC. B.) 
Haz. In the Tamar, at and above Georgetown. Also at Port Arthur. 
Primary fronds 1-2 inches long, half an inch wide, very obtuse at each end, membranous, entire, traversed by 
a strong, cylindrical midrib, the membrane marked with pellucid striæ running obliquely from the midrib to the 
margin. By continuous hypophyllous branching, the compound frond at length becomes 6-8 or 12 inches long, 
and as much in expansion, and is excessively branched and bushy, consisting of oblong, obtuse leaves similar to 
that of the primary frond. The leaves are frequently opposite. Colour a full carmine-lake. Substance membra- 
naceous, resisting the action of fresh-water. Both cystocarps and tetraspores are borne in minute accessory frondlets 
that spring from the midribs of the larger leaves. 
A handsome and well-marked species. It most resembles luxuriant specimens of p ruscifolia, but differs 
essentially from that species by the very different evolution of the fructification. The frond is m of a much firmer 
substance, and adheres less strongly to paper.—PraTE CXC. B. Fig. 1, a frond, the natural: size; 2, spore-leaf, 
with tetraspores; 3, a tetraspore; 4, spore-leaf with conceptacle; 5, section of eonceptacle:—the latter figures 
magnified. | 
3. Delesseria crassinervia (Mont. Pól. Sud, p. 164. t. 8. f. 1; Harv. 
Ag. Sp. Alg. ii. p. 694). 
Haz. Sullivan's Cove, Dr. Zyall. 
Disrris. Antarctic Coasts and New Zealand. 
4. Delesseria? Leprieurii (Mont. An. Sc. Nat. ii. Ser. xiii. p. 196. t. 5. f. 1; Harv. Ner. Austr. 
p. 116; J. Ag. Sp. Alg. ii. p. 682; Harv. Ner. Bor. Amer. 11. p. 98. t. 22 C). 
Haz. Abundant on tidal rocks near the mouth of the Tamar. 
Ner. Austr. p. 115; J. 
