118 PAKtfARIA. 



ordinary gonidia are sufficiently conspicuous in our lichen, to- 

 gether with more or less similar red gonidia, and, with these, as 

 in the European, smaller and less abundant gonimia. And 

 these differing forms of the gonidial cells belong all to the plant 

 before us, and are neither to be referred, in part, to an intru- 

 sive, foreign Alga (as supposed in Nyl. Scand. p. 171) nor, in 

 part, to a foreign Lecanora (as asserted in Nyl. Lapp. Or. p. 

 104). And they condition that red and white marbling of the 

 thallus which is so conspicuous in section. The plant is thus 

 referable neither to Lecanora, as supposed by Sommerfelt, and 

 Nylander (Scand.) nor to Pyrenopsis, as by the latter author in 

 Lapp. Or.-, but must either find a place here, or as a distinct 



genus of Parmeliei. In the group Euopsis, Nyl., which has 



not yet, that I am aware, been characterized, but is noted by 

 its author as distinguishable from his Pyrenopsis, with which he 

 associates it, in Collemei, by the form and higher structure of 

 its apothecia (Flora, 1875, p. 363) I am compelled to include 

 his Pyrenopsis hcematopis. 



3. P. granatina (Sommerf.) ; thallus minute, monophyllous, 

 attached at a single point, rounded or difform, thickish, warted ; 

 brown-reddish; crowded often into a loose crust; beneath 

 blackening but not otherwise differing ; apothecia very small, 

 adnate, the shining, red-brown, flat or swelling disk bordered 

 by a sub-crenate margin. Spores oblong, simple, decolorate, 



^ m i c . Lecanora, Sommerf. Suppl. Lapp. p. 90. Nyl. Scand. 



p. 171. Pannaria, Th. Fr. Llch. Arct. p. 77. 



Rocks, Notch of the White Mountains, Tuckerman Gen. 1872. 



Maine, Willey. Collema licemaleum var. hcematopis, Sommerf. 



(Pyrenopsis htsmatopis, Nyl. ; Th. Fr. ) which was found in Green- 

 land by Vahl, is considered to differ in its concave fruit j but 

 the published European plant (Nyl. in Fellm. Lick. Arct. n. 5) 

 has so entirely the structure of Pannaria granatina that I can- 

 not venture, with the material before me, to separate it even as 

 a variety. And it is observable that Nylander has referred one 

 and the same lichen (the Pyrenopsis rufescens of his Lick. 

 Scand. p. 27) at p. 288 of the same work to P. hcematopis, and 



in Lapp. Or. to P. granatina. Pannaria granatina var. 



hcemalea, Th. Fr. ( Collema hcemaleum, Sommerf. Euopsis hama- 

 lea, Nyl. in Norrl. Lick. Fenn. n. 101) also has the structure of 

 P. granatina ; of which it appears to be a reduced expression. 

 It is unknown here. 



