AlgcR^ 
SOCIETY ISLANDS. 
77 
secundis ovatis acuminatis apice obscure serratis enerviis laxe reticulatis membranaceis nitidis, 
seta laevi apice arcuato-curvata, theca (parva) ovata bi'evi, operculo hemisphaerico mucronato. 
(Tab. XIX.) 
This plant is loosely tufted, and the mass exhibits a brownish hue, Hite many Jungermannia. Although 
the leaves be slightly secund, it belongs certainly to the distichous division. 
Tab. XIX. Hypnum fuscescens. Fig. 1, Plants: — natural size; fig. 2, Single plant: — magnified; fig. 3, 
Portion of the stem, with leaves; fig, 4-, Single leaf; fig. 5, Capsule; fig. 6, Lid; fig. 7, Calyptra; fig. 
8, Portion of the inner peristome ; fig. 9. Portion of the outer do. : — all more or less magnified. 
Ord. LIV. hepatic^. Juss. 
1. Anthoceros IcBvis. Linn. 
1. Jungermannia multifida. Linn. 
Ord. LV. LICHENES. Juss. 
1. Lecidea Cocoes. Sw. Lich. Am. p. 2. t. 2. 
1. Parmelia pannosa. Ach. — Sw. Lich. Am. p. 6. t. 6. 
The Parmelia strigosa and Sandwichiana of Gaudichaud in Freycinet’s Voyage, and Pannaria erythro- 
carpa of Bory in Duperrey’s Voyage, seem identical with this species. 
2. Parmelia calicarpa ; diffusa, thalli laciniis imbricatis latis rotundatis sinuatis plumbeis 
rugulosis gelatinoso-membranaceis, apicibus convexis, subtus intense fuscis subpubescenti- 
bus, apotbeciis majusculis undulatis rufis margine crenato foliaceo. 
The nearest affinity of this species is perhaps P. colpodes of Acharius, figured by Swartz in his American 
Lichens, t. 4. f. 3 ; but the lacinise of the frond in our plant are much broader, and the margin of the apo- 
thecia more evident, crenate, lobed, and leafy. 
1 . Collema Turneri ; thallo foliaceo membranaceo gelatinoso pellucido badio, lobis 
irregularibus plicato-undulatis, apotbeciis sparsis majusculis convexis centro depressis fuscis, 
margine amplo rosulato foliaceo. 
This Collema is perfectly distinct from any we have yet seen or can find described. It grows upon the 
trunks of trees, in large patches of a deep brown colour, and of a thin gelatinous texture, the lacinise round, 
much waved, and crisped ; the margin of the apothecia is very remarkable, forming a beautiful leafy circle 
around the fruit, and five or six times broader than the young fructifications. The C. phyllocarpum of 
Gaudichaud, (Freyc. Voy. p. 204,) from Brazil, differs in the glaucous colour of its foliage, but the margin 
of the apothecia appears to be the same. 
1 . Usnea plicata. Ach. Syn. Lich. p. 305. 
1. Ramalina /iomafea ; tballo compresso ancipiti Imvigato nudo ramoso albo pallescente 
transversim subrimoso, ramis dicbotomis attenuatis, apotbeciis sparsis centro affixis concavi- 
usculis subimmarginatis concoloribus. Ach. 
a. cartilagineo-cornea subpellucida, apotbeciis valde concavis. 
(3. cartilaginea opaca, apotbeciis planiusculis. 
We possess both these varieties from JMr. Menzies : the former, gathered in California, must be viewed 
as the true plant of Acharius. Both are in the present Collection, from Tahiti. 
Ord. LVL ALG^. Juss. 
1. Macrocystis Humboldtii. Ag. Sysf. Alg. p. 293.— M. pomifera. Bory in Duperrey 
Voy. V. 1 . p. 94. t. 9. 
