320 DR. LINDSAY ON WEST-GREENLAND LICHENS. 
rently following Massalongo. Taurica passes into Cladonia gracilis, var. macroceras, in 
(Eland, says Th. Fries (L. Arct. p. 162), and is therefore not autonomous, according to 
him, but a monstrosity of that Cladonia. Mudd includes vermicularis in Cladonia, in his 
‘British Cladoniæ,’ though not in his ‘Manual.’ He refers the spermogonia, described 
by Nylander (in his ‘Lich. Scand.’ p. 68), to Endocarpon Crombii, Mudd (Brit. Clad,, 
p. 36), evidently another to be added to the several parasites that infest this puzzling 
lichen. My Microthelia vermicularia is apparently what Th. Fries refers to as a parasitic 
Buellia ; it is given in Rabenhorst's Exsiccati, No. 253, and was mentioned by the late 
Robert Brown (feste Th. Fries. L. Arct. p. 161). 
Gen. 8. ALECTORIA. 
1. A. jubata, L., var. chalybeiformis, L.— Jakobshavn.  Chalybeiformis does not 
deserve a separate name; it is a mere saxicolous form, sometimes as long as corticolous . 
states, though generally blacker and more glossy. Sometimes pruinose or white, largish, 
sorediiferous warts, mostly oblong-ellipsoid, are seated at the angles of the filaments. 
Through dicolor*, it appears to pass into ochroleuca (rigida and nigricans) and thulensis. 
2. A. ochroleuca, Ehrh.—Godhavn; Jakobshavn ; Illartlek Glacier. Varies consider- 
ably in colour, height, degree of ramosity, and size of its divisions. Its normal colour 
is beautiful lemon-yellow. In this condition it gives no reaction with potash. But it is 
also variously buff-coloured, grey, white, brown, or black ; or it exhibits various combi- 
nations of these colours; or the thallus is variously mottled. The grey forms give a 
lemon-yellow reaction with potash. The black forms t, which are abundant about God- 
havn, do not differ in other respects from the typical plant. There seems to be a series 
of forms connecting ochroleuca, through thulensis and divergens, with Cetraria aculeata. 
Ochroleuca, in Greenland, is sometimes short and cæspitose; or long and simple, corre- 
sponding to some of the simple states of Usnea barbata. 
Var. rigida, Vill. (Th. Fries, L. Arct. p. 27), with black apices, is common, but is 
undeserving separate nomenclature. 
3. A. thulensis, Th. Fr., does not appear to me to be autonomous. In his ‘L. Arctoi,’ 
Fries makes a separate subspecies of it, arranging it under 4. ochroleuca ; while in his 
* L. Spitsbergenses,’ he makes it a synonym of 4. nigricans. | 
4. A. divergens, Ach., is sometimes, at least, confounded with, and probably belongs 
to, Cetraria aculeatat. It bears white sorediiferous warts, which are minute, compared 
with those in chalybeiformis. : 
* In specimens of var. bicolor in the Edinburgh University Herbarium, from Scotland, Switzerland, and the Arctic 
regions, the plant does not differ much from var. nigricans of A. ochroleuca. It is a mere condition or form, refer- 
able partly to jubata and partly to ochroleuca. ; 
t In specimens of var. nigricans, determined by Leighton, from Great Bear Lake, in the Edinburgh University 
Herbarium, the thallus is black only at the tips of the ramuscles; and the plant deserves no separate name, even as 
a form. f 
i In the Edinburgh University Herbarium I found specimens from Great Bear Lake, Richardson, 1826, deter- 
mined by Leighton; Newfoundland, Despréaux, 1833, and Lenormand, 1830; * Arctic Regions, Parry's Second 
Voyage, Edwards, and * Overland Canadian Expedition of 1823, Richardson; in which the plant might be referred 
in its various forms, partly to C. aculeata, and partly to A. jubata and A. ochroleuca (nigricans). 
