20 
BOTANY OF KERGUELEN ISLAND. 
1. Dicranum (Isocabpus, Mitt.) tortifolium, Uooh. f. et Wits. FI. Ant- 
arct. 404, t. 152, y. 5 (Weissia). 
Ilab., Christmas Harbour, on gravelly banks, Uooher. Under the shoot of a 
waterfall near Vulean Cove, with old capsules and young seta?, Eaton. 
In compact tufts I-I 4 inch high. Uoliage very green above, below becoming 
brown. Old capsules black and shining ; young calyptras orange brown. 
2. Dicranum (Isocarpus) strictum, Hook. f. et Wits. Ft. Antarct., 404, 
t. 152,/! 4 (Weissia). 
Christmas Harbour, on rocks near the sea. Hooker. 
This has been described as dioicous, but the male flower is terminal on a 
branch arising some distance below the pericha?tium. The peristome has rather 
hroad thin teeth ; in the solitary example Avhich could be examined, the teeth ap- 
peared to bo partly adherent in pairs, the median line is obsolete. This species 
is closely related to I>. tortifolium. 
3. Dicranum (Hemicampylus, Mitti) robustum, Hook. f. et Wits. Ft. 
Antarct. 406, t. 152, /. 8, var. lucidum ; H. pungens, var. lucidurn. Hook. f. et 
Wits. 1. c. 
Hah. Christmas Harbour, Hooker, Moseley. 
Known only in a barren state. 
3. Dicranum (Hemicampylus) kerguelense, C. Muller, Syn. i. 370. 1). 
Boryanum, Sclmaegr ; Hook.f. et Wils. Ft. Antarct. 406. H. dichotomum, Beauv. 
Prodr. 51 (Cecalyphum) . 
Christmas Harbour, Hooker. On an elevated moor. Royal Sound, Eaton. 
microcarpa the pericliaetium is formed of leaves reduced in size like tliose which usually include the anthe- 
ridia, and thus another modification of the pericha;tium is produced, all other i)articulars being as in Blindia 
proper. Thus, by the difference in the leaves of the pcrichaetium, the species are separable into several 
groups : — 
Stylostegium, B. & S. j — theca in perichretio e f'oliis caulinis ampliatis immersa. 
Blindia, B. & S. ; — theca e perichactio e foliis basi vaginantibus caulinorum inagiiitudinis exserta. 
Ilomogastrium ; — theca e pericha;tio microphyllo exserta. 
The differences in the leaves of the perichsetium between Stylostegium and Blindia are analogous to 
those which exist between the Grimmics of the sections Schistidium and Grinimia; between Hedwigidium 
and Braunia ; between some Bartrarnice of the section Lcucomcla and Eubartramia ; and also between the 
Schlothcimim of the sections Stegothcca and Etischlothcimia. States of the perichastium analogous to that 
observable in B. microcarpa occur chiefly in mosses which produce their fruit from the side of the stem, 
as Amectangium, and in some species of Fissidens. Amongst the Neckeroid mosses pericha^tia may be 
observed in otherwise closely resembling species which are analogous to all three of the states here left in 
Blindia. Much time and many words might be saved in the description of mosses in which the pericha;tium 
is an important character, if some term at once conveying the essential part of the above information were 
employed, thus : — 
Chanogastriati ; — pei'ichsetium e foliis elongatis ampliatisque 'Sx\ims,=Stylostegmm, Schistidium (Grim- 
mieae), llcdwigia, Hedwigidium, Cryphcea, Ecckcra. 
Ileterogastriati ; — pericliEetium e foliis elongatis inferne convolutis clausum =7?W«c?ia, Dicj-amim, 
llypnum, &c. 
Homogastriati ; — perichajtium e foliis abbreviatis iis perigonii similibus formatum=i?/f«rfia microcarpa, 
Anvcctangium, Vyrrhobryum, &c. 
