Carjoomitra.'] 
XX. ALGJE. 
655 
terete below, compressed or fiat above, much pinnately divided. Receptacles 
short, conic, sessile on truncate branchlets. — J. Ag. Sp. Alg. i. 177 ; Harv. 
Phvc. Brit. t. 14. Fuchs, Turner, Hist. t. 140. 
Probably common, Cook’s Straits, Lyall ; Hawke’s Bay, Colenso. (Tasmania, Europe.) 
2. C. HalyseriSj Hook.f. and Harv. FI. N. Z. ii. 216. t. 110 A. 
Frond much broader than in 0. Cabrerae, in. broad, linear, flat, with a 
distinct midrib. — J. Ag. Sp. Alg. i. 179. 
Bay of Islands, Cunningham, etc. Probably only a broad form of H. Cabreras. 
16. DESMARESTIA, Lamouroux. 
Root a disk. Frond dull olive-green, linear or filiform, flat or com- 
pressed, distichously branched ; structure cellular, surrounding in one species 
a single slender-jointed tube, which traverses the axis; branches when 
young producing marginal tufts of very slender flaccid branching filaments. 
Fructification unknown. 
A genus of several species, inhabiting both temperate zones. 
1. D. ligulata, Lamouroux ; — FI. N. Z. ii. 217. Frond very variable, 
a foot or more long, flat, membranous, costate, pinnate, with a central ar- 
ticulate tube ; pinnae oblong or linear-lanceolate, decompound, ultimate ser- 
rate or ciliate. — J. Ag. Sp. Alg. i. 169; Harv. Phvc. Brit. t. 115. Fucus, 
Turn. Hist. t. 98. 
East coast, Colenso ; Akaroa, Lyall. (Australia, Chili, Euegia, S. Africa, N. Atlantic.) 
2. D. viridis, Lamouroux ; — FI. Antarct. i. 178. Frond a foot long 
and upwards, slightly compressed, pinnately decompound, solid, without a 
central articulate tube, ecostate, ultimate branches capillary, passing into 
pencils of jointed filaments. — J. Ag. Sp. Alg. i. ; Harv. Phyc. Brit. Fucus, 
Turn. Hist. t. 97. Dichloria, Greville. 
Lord Auckland’s group, J. I). II. (Kerguelen’s Land, N. and S. Pacific, N. At- 
lantic.) 
17. MACRQCYSTIS, Agardh. 
Root branching, giving off immensely long slender simple stems, which 
bear leaves at the surface of the water. Leaves formed by the continued 
splitting of a primary terminal leaf, developed in second order along the 
lengthening floating stem, each lanceolate, serrate, ribless, undulate, with a 
pyriform oblong or subcylindric bladder at its base. Spores superficial on 
submerged radical leaves, forming clouded sori, ellipsoid, with a hyaline coat, 
surrounded by densely packed inarticulate clavate peranemata. 
A most wonderful well-known southern Alga, forming a breakwater of matted fronds in 
deep water. Only one species is known, the following, which includes all the species of J. 
Agardh, Sp. Alg. i. 155-158, except M. obtusa (which is Phyl/ospora Menziesii) . 
1. M. pyrifera, Anardli ; — FI. N. Z. ii. 217. Stems 50 to perhaps 700 
ft. long or upwards. Fronds extremely variable in length and breadth, 2-4 
ft. long, 2-6 in. broad, ciliate-serrate. — Fucus, Turn. Hist. t. 110. 
