| and 
chisve 
nudis, 
dus y, 
vitate 
tina, 
nosing 
frondis 
cls 
nel, 
010 
eve, 
Campbell’s Islands. | ۱ CRYPTOGAMIA ANTARCTICA. 77 
6-20 unc. longæ, rarius bi-tripedales, crassee, simplices v. furcatee v. ad basin bipartite, nunc margine frondes acces- 
sorias emittentes, interdum poris perplurimis pertuse. Superficies frondis levis, lucida, adulta papillosa; papillis 
creberrimis, tandem totam frondem utrinque vestientibus, apice fructiferis, favellidia immersa poro pertusa gerentibus. 
Spore minute, roses, densissime aggregate. Spherospore frondibus papillarum destitutis immerse, substrato cor- 
ticali site, in globulis minutis punctiformibus aggregate, totam frondem pustulantes. Substantia crassa, carnosa. 
Color lividus, rubescens purpurascensve, raro atro-sanguineus. 
There is scarcely a maritime rock on the Antarctic coasts, that does not abound with this most protean species 
in all stages of growth, and bearing fronds with every variety of outline. It is much eaten by marine animals, and 
from this or other causes, amongst which may be reckoned the fall of the fructiferous papillee, the plant is frequently 
found more or less perforated with round holes, sometimes so regularly as to resemble coarse lace: this state has 
been described by Kützing, under the name of Chondrodictyon Capense, and by Decaisne as Iridea clathrata (Ann. 
Sc. Nat. Ser. IIT. vol. ii. p. 236). More puzzling is the form of the secondary fructification or spherospores, which 
is so like a primary fruit, that had not both Mr. Harvey and myself seen this plant growing on its native rocks, we 
should have supposed the individuals producing them to belong to a different species. The secondary fruit of 
I. stiriata is of the same nature. 
The J. micans, Bory, volans, Grev., and laminarioides, Bory, enumerated by Montagne as natives of Lord 
Auckland’s group, are probably states of this. 
28. HALYMENIA, ۰ 
1. Hatymenta latissima, Hook. fil. et Harv.; fronde plana tenui gelatinoso-membranacea latissime ovato- 
lanceolata simplici bifida v. margine laciniato-pinnatifida, laciniis ovato-lanceolatis acutis. (Tas. LXXIII.) 
Var. 8, bifida; fronde lanceolata basi attenuata bifida v. bifurcata, laciniis lanceolatis erectis. 
Has. Lord Auckland’s group and Campbell’s Island ; both varieties abundant on rocks in the sea. 
Frondes 2-14 une. long, 4—6 late, tenues, basi cuneate, late lanceolate v. ovato-oblonge, acute, simplices 
v. furcatee, margine plano simplici integerrimo v. laciniis plurimis subpinnatifido. Substantia gelatinosa. Favellidia 
numerosissima, per totam frondem sparsa, cellulis medullaribus immersa. Color amene roseus. 
We offer this as a new species with some doubt, the varieties of H. ligulata approaching it. The fronds are 
so broad and thin, that the favellidia form convexities on its surface, which are more or less obliterated when moist. 
Prate LXXIII. Fig. 1, portion of the surface of the frond; 2, section of the same; 3, spores :—all magnified. 
29. DUMONTIA, Lamour. 
1. Dumontia filiformis, Grev., Alg. Brit. p. 165. t. 17. Halymenia, Agardh Spec. Alg. vol. i. p. 214. 
Haz. Campbell’s Island. (Dr. Lyall.) 
Identical with the European plant. Found also at the Cape of Good Hope and in other widely separated localities. 
2. Dumontia cornuta, Hook. fil. et Harv.; fronde tubulosa hic illic inflata divisa, parte inferiore nu- 
diuscula superiore ramis confertis fasciculatisve quadrifariis vestita, ramis furcatis patentibus flexuosis alter- 
natim ramulosis, ramulis recurvis utrinque attenuatis apicibus acutis. 
Has. Campbell’s Island. (Dr. Lyall.) 
Frondes cæspitosæ, 2-3 unc. long&, tubulos, irregulariter inflates, 2 lin. late, vage divisee; ramis intricatis, 
patentibus, flexuosis, furcatis; ramulis fusiformibus, patentibus v. recurvis. Color fuscatus, badius v. rubescens. 
Our specimens of this plant are barren; we refer it to Dumontia from the tubular inflated frond, structure, and habit. 
U 
