74 CRYPTOGAMIA ANTARCTICA. [Auckland and 
do they agree in habit, that plants regarded by the elder Agardh as varieties of PJ. coccineum (8 and y) are considered 
by his son as distinct species of Thamnophora*. : 
1. Procamium coccineum, Lyngb.; Hydr. Dan. p. 39. t. 9. Grev. Alg. Brit. p. 12. t. 98. Hook. 
Brit. Fl. vol. ii. p. 293. P. vulgare, Lamour. Pl. coccineum, fenestratum, Lyngbyanum, et Binderianum, 
Kütz. Phye. Gen, p. 449 and 450. 
Has. Lord Auckland’s group and Campbell’s Island; abundant. 
This is the only species of the genus found in the northern hemisphere and is apparently common, especially 
in all temperate regions of the globe. 
20. RHODOMENIA, Grev. 
1. Ruopomenta Hombroniana, Mont.; “fronde cartilagineo-membranacea plana e basi substipitata 
dichotoma pinnatifissa, pinnis ob axillas obtusas patenti-erectis obtusis, margine fimbriato seu ramenta den- 
tata conceptaculifera emittente, conceptaculis hemisphericis papillula instructis." Mont. Prodr. Phyc. An- 
taret. p. 1. Voy. au Pole Sud, Bot. Crypt. p.197 . t. 1. f. 2. (Tas. LXXII. Fig. IL.) 
Has. Lord Auckland’s group; on the stems of large ۰ 
Our specimens of this plant are young, and as they differ from the more advanced state in form and in colour, 
we have added a figure; the colour in this state is of a beautiful red purple, sometimes inclining to violet. When 
fully developed, the species assumes the appearance represented by Dr. Montagne in the plate quoted above. We 
are indebted for magnificent specimens, collected at Akaroa, to M. Raoul. 
Prate LXXII. Fig. II.—1. a young specimen, of the natural size; 2, 3 and 4, marginal leaflets bearing the 
fructification ; 5, section of the same :—magnified. 
2. RHODOMENIA ornata, Mont.; “ fronde carnoso-membranacea oblongo-lanceolata latissima plana vivide 
purpurea utrinque margine prolifera, foliis s. pinnulis obovatis substipitatis tandem cuneatis maximis palma- 
tifissis, conceptaculis per totam frondem sparsis" Mont. Prodr. Phye. Autarct. p. 1. Voy. au Pole Sud, 
Bot. Crypt. p. 160. t. 11. 
Has. Lord Auckland’s group. (Admiral D’ Urville.) 
The plant, from which the magnificent plate given by Montagne was executed, is marked by the lamented 
D’Urville as a native of Lord Auckland’s Island, where, we regret to say, it was not collected by the Antarctic Ex- 
pedition. 
3. RuopowrNiA dichotoma, Hook. fil. et Harv.; fronde membranacea rosea basi cuneata latissima dicho- 
toma, axillis rotundatis, laciniis patentibus linearibus v. cuneatis obtusis demum emarginatis et bifidis. 
(Tas. LXXII. Fig. I. 
Has. Campbell’s Island; on rocks in the sea. 
* T had long supposed that the spheerospores of these genera were different ; but after a complete examination 
of the fruit of T. corallorhiza, costata, angusta, Mertensii, procera, Cunninghamit, Telfairie and cornuta, and compa- 
rison with that of Pl. coccineum, I have been obliged to abandon this idea. In all, the spheerospores are cylindrical, 
divided into four by three transverse strie. Kützing separates Pl. cornutum under the generic name of Thamnocarpus, 
but I am at a loss to conceive upon what grounds.—W. H. H. 
py, A ee > 
