Falklands, etc.] CRYPTOGAMIA ANTARCTICA. ۱ 171 
Puare CLXXX.—Fig. 1, portion of frond and coccidia ; fig. 2, portion of ditto vertically sliced; fig. 3, spores 
from the same ; fig. 4, immature ditto :—all highly magnified. 
21. ACANTHOCOCCUS, Hook. fil. et Harv. 
Frons linearis, compressa, distiche ramosa, cartilagineo-carnosa, rosea. Axis solidus, densus, e cellulis minutis- 
simis formatus, tubulis magnis pluriseriatis extus sensim minoribus circumdatus. Peripheria celluli parvis reti- 
culata. Coccidia globosa, in apicibus ramulorum immersa, sporis numerosissimis repleta. 
1. AcawtHococcus Axtarcticus, nobis, in Lond. Journ. Bot. vol. iv. p. 261. (Tas. CLXXXI.) 
Haz. Cape Horn and the Falkland Islands; not uncommon, and parasitic. 
Frons 4-8 unc. longa, compressa, anguste linearis, basi semilineam vix lineam latitudine, sursum sensim 
angustata, distiche ramosissima, Rami patentes vel divaricati, nunc flabellatim multifidi, nune pinnati et bipinnati ; 
secundarii nunc breves subsimplices, nunc longissimi, ramosissimi, Ramuli per totam frondem sparsi, apicem versus 
crebriores, erecti et erecto-patentes, subulati, 1-3 lineas longi, alterni vel scepius secundi, simplices vel parum divisi. 
Coccidia solitaria, globosa, spinis 4-6 magnis subulatis armata, in apicibus ramulorum immersa, sporis numerosissi- 
mis minutis repleta. Tetraspore ignote. Color intense ruber, siccitate obscurior. Substantia firma, cartilagineo- 
carnosa :—chartee adheeret, 
We cannot satisfactorily include this plant under any established genus. It belongs, unquestionably, to the 
Spherococcez and will stand near Hypnea, from which it differs in the structure of the frond, as well as in the 
fructification. The densely cellular axis, surrounded by large empty cellules or tubes, is seen in Hypnea musci- 
formis, and also in Gracilaria purpurascens: Outwardly there is a close resemblance between our plant and Heringia 
rostrata, J. Ag., (Gelidium ? rostratum, Griff. ; Fucus alatus, and angustissimus, Turn.) ; but, besides the dissimilar 
fructification, the structure of that plant is uniformly dense, without a trace of large cellules, or tubes. Again, 
the present plant may be compared with Microcladia, which it approaches in habit; and to a certain extent, the 
spinous coccidia may be deemed analogous to the involucrated favelle of that genus; but, in Microcladia, the axis, far 
from being the most dense part of the frond, is tubular, 
Pirate CLXXXI.— Fig. 1, ramulus; fig. 2, apex of ditto with coccidium ; fig. 3, transverse section of ramulus ; 
fig. ^, longitudinal section of coccidium :—all magnified. 
22. GRACILARIA, Grev. 
1. GRACILARIA (?) nigrescens, Hook. fil. et Harv.; radice fibrosa, frondibus purpurascentibus cæspitosis 
e basi irregulariter dichotoma et intricata ramosissimis gracilibus subcylindraceis obscure compressis flexuosis 
flaccidis carnoso-membranaceis, axillis obtusis sæpissime latis, ramis decompositis sensim angustatis, ramulis 
filiformibus v. subulatis acutis, ultimis sæpe secundis. G. obtusangula, nobis in Lond. Journ. Bot. vol. iv. 
p. 260. Sphærococcus subulatus, 8. nigrescens, Agardh, Sp. Alg. p. 329. 
Var. 8. tenuior, ramis strictioribus divaricatis, axillis patentibus. 
Has. Hermite Island, Cape Horn, and the Falkland Islands; not uncommon. Var. 8. Falkland 
Islands. 
Frons basi repens et fibrosa, filiformis, 4-6 unc. longa, + lin. lata, subeompressa. Color luride purpureus, ut in 
G. purpurascente. ۱ 
In the absence of fructification we refer this doubtfully to the genus Gracilaria, chiefly from its close resemblance 
to the G. purpurascens in the essential characters of the frond. We have never seen original or any other specimens 
of the Spherococeus subulatus, var. nigrescens, and owe the identification of our specimens with that plant to the 
kindness of our friend Dr. Montagne. 
Y 
