326 DR. LINDSAY ON WEST-GREENLAND LICHENS. 
which gives them a yellow colour and a corrugated, bolder margin. In some cases the 
basidia remain attached. These basidia are very indistinct, and the connexion between 
them and the stylospores cannot be well made out with the powers of my microscope 
(which magnifies from 90 up to 600 diameters linear). But they appear to be thick- 
walled arthro-sterigmata somewhat like those of Endocarpon and Umbilicaria; and 
if they are so, the secondary reproductive organs of this Peltigera may be regarded either 
as spermogonia or pycnidia, having the sterigmata of the former, and the stylospores of 
the latter, forming, in truth, a link of connexion between these two great groups of com- 
plementary reproductive organs*. The present instance is the first in which I have 
succeeded in detecting fertile pyenidia in Peltigera, though I have searched for them 
carefully in numberless specimens, a cireumstance that illustrates the undue proportion 
that negative bear to positive results in spermogonological research. In Britain, Illo- 
sporium corneum, Fr., occurs as a parasite on P. canina (Berk. * Brit. Fungology,' p. 341), 
as does also Scutula Wallrothii, Tul. 
9. P. scabrosa, Th. Fries, does not occur in the present collection, but is apparently a 
Greenland lichen. Specimens in my herbarium from the Kikerton Islands—collected by 
Taylor, named and given me by Prof. Dickie—appear to be merely an arctic form of what 
would, in more southern countries, probably be referred to horizontalis. The genus 
Peltigera is very much in the position of Usnea, Ramalina, Cladonia, and many 
others, as to the diffieulty of dividing the many puzzling forms composing it into scien- 
tific “ species.” I see no difficulty in regarding all the British Peltidee as referable to a 
single type—canina. That which stands out most distinctly from the rest is venosa +. 
In the Kikerton scabrosa, the asci are blue with iodine, ‘0024 long and :00040” broad, 
8-spored. The filaments of the paryphyses are thick and simple; the tips conglutinate 
and pale brown. The sporidia are very narrowly (or linear) fusiform, multilocular, 
0012" to :0018" long and :00009" broad, straight or curved, so delicate, long, and 
narrow as to be apt to be confounded with the paraphyses. 
Gen. 13. SOLORINA. 
1. S. crocea, L. On loose soil about the Illartlek glacier; apothecia abundant.—Lynge- 
marken. Central portions of the thallus in some specimens have lost colour and become 
whitish or ashy grey; and these decolorized patehes are plentifully studded over with a 
black, punetiform or papillæform parasite, which is eonspieuous by reason of the con- : 
trast of colour. "The hymenial gelatine and the constituent parts or tissues of the 
hymenium give no blue with iodine. Paraphyses are very delicate and not knobbed at 
_ tips, their characters being those of Verrucaria and Endocarpon. Asci in tufts, 8-spored, 
'0015" long and :00045” broad. Sporidia 4-locular, fusiform, colourless, -0006” long 
and *00015" broad. 
* Compare the contrasted characters of Spermogonia and Pyenidia, given in my Papers on “ Polymorphism in the 
Fructification of Lichens," before quoted ; also the description of the spermogonia, or pycnidia, of Peltigera and their 
contents, in my * Mem. Spermog.' pp. 173-4, and in Tulasne's « Mémoire" in the Ann. des Sciences Nat. Ser. iii. - 
Botanique, vol. xvii. 1852, pl. ix. figs. 7-17. : 
t Vide footnote on preceding page. 
