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Campbell's Islands.) CRYPTOGAMIA ANTARCTICA. | 19 
Has. Lord Auckland's group and Campbell’s Island; on moist rocks at an altitude of 1200 feet in 
the former locality, descending lower in the latter. Var. 8, Lord Auckland’s group, with the former. 
Caules sesquiunciales, ceespitosi, fastigiatim ramosi, ramis gracilibus. Folia erecta, subsecunda, striata, sicci- 
tate appressa, subrigida, longe lineari-setacea, basi, lanceolata, vaginantia, flavo-viridia, inferiora nigrescentia; nervo 
valido continuo, apicem versus obtusum denticulatum paulo dilatato; perichetialia majora, convoluta. JInflores- 
centia dioiea; Fl. masc. terminalis, gemmiformis. Seta vix uncialis, pallida, subtorta. Theca erecta, ovate, cylin- 
dracea, basi rotunda, badia, lævis, nitida. Peristomii dentes breves, fere horizontales, madore conniventes, siccitate 
erecti, pallide ferruginei. Annulus majusculus. Spore majuscule. Operculum conico-rostratum, erectum, theca 
paulo longior. Calyptra theca longior, scariosa, fusca, latere fissa. 
The singular apex of the leaf distinguishes this species, even in a barren state, from Weissia contecta, or any 
similar moss. vd. Trikot [a e thir ) rn S he (nta) 1 
Prats LIX. Fig. II.—1 and 2, specimens of the natural size; 3 and 4, leaves; 5 and 6, thecee ; 7, peristome ; 
8, teeth; 9, calyptra :—magnified. 
15. CERATODON, Brid. 
Peristomium simplex ; dentibus basi liberis, bipartitis, cruribus trabeculisque horizontalibus connexis, superne 
solutis, flexuosis. Calyptra cuculliformis. Theca insequalis, annulata, tandem profunde sulcata, substrumosa.—Cera- 
todon, Brid. Bryol. Univ., vol. i. p. 480. 
1. Ceratovon purpureus, Brid. ; l.c. Didymodon purpureus, Hook. et Tayt. Musc. Brit. p. 113. t. 20. 
Dicranum, Hedwig, Sp. Muse. p, 136. t. 36. 
Haz. Lord Auckland's group and Campbell’s Island; on the ground, abundant. 
16. POLYTRICHUM, Z. 
Peristomium simplex; dentibus 32-64, brevibus, inflexis, cartilagineis, apicibus membrana horizontali (epi- 
phragma) connexis. Theca exannulata, ore epiphragmate (e columellz apice dilatato) clausa. Calyptra cuculliformis, 
glabra, v. indusio villoso e pilis intertextis obtecto. ^ Theca exannulata.—Psilopilum, Catharinea, Pogonatum et 
Polytrichum, Bridel et auctorum. 
We would gladly avail ourselves of Bruch and Schimper's subdivisions of this genus, as proposed in the * Bryo- 
logia Europea,” did not the antarctic species prove them to be unnatural Even the European species do not coin- 
cide with the views of those authors, for the Pogonatum nanum, Br. and S., has the inner membrane of the sporangium 
surrounding the columella perfectly cylindrical, and thus is at variance with their definition; and there is nothing 
essentially different between its structure and that of 4trichum, of the corresponding membrane in which no mention 
is made. This inner sporuliferous lining of the columella exists in all mosses, as well as in the 4trichum undulatum, 
Br. and S., and is the portion of the seminal sac, which, being inverted at the base, ascends the axis of the theca 
surrounding the columella; it forms the visible columella; the tissue itself, being often of extreme tenuity, is fre- 
quently overlooked and its continuity with the sporular membrane is not always evident. We have attempted to 
explain this structure at p. 8, under Sphagnum. That the characters derived from the calyptra are not of generic 
value is proved by that organ being exposed in P. magellanicum and dendroides, which have otherwise all the cha- 
racters of Pogonatum. The origin of the villous hairs composing the outer calyptra of many species and their 
original attachment to the vaginula did not escape the notice of Ehrhart and Mohr and subsequently of Wahlenberg, 
although overlooked by Bruch and Schimper, whose analyses of the genera of mosses are unequalled in point of exe- 
