(281 ) 
to be regarded distinct in species by its author (Syn. N. Caled. p. 34). T. subtile 
is quoted also as an Irish lichen (Leight. Lichen-fl. Gr. Brit. p. 248). 
P.149. Thamnolia, Scher., Nyl. Lindsay, who describes and figures the 
spermogones found by him, and by Nylander, on the Cladonia vermicularis of 
authors, remarks (on Spermogones, &c., 1. c. p. 142, t. 5, f. 20-23) that “it is sel- 
dom that the spermatia and sterigmata can be found; at least I have examined 
several dozens of specimens from every variety of habitat, and, though I long sus- 
pected these warts of being spermogones, I have only been able to satisfy myself 
as to their true character —by discovering the spermatia and sterigmata— in a 
single instance.” 
! 
P. 163, line 26; read Welwitsch. 
P. 167, line 5 of note; read quernea. 
P. 170, line 30; read Acolium. 
P. 181, last line; read Heterothecium. 
P. 187, line 35; read pales. 
P. 222, line 21; ARTHONIA pinguis should be erased; and the lichen is rather 
to be taken for an imperfect Biatora sp. incert. (H. Willey in litt.) 
P. 233, line 7; read Christiania. 
P. 268, line 10. VeRRUCARIA striatula, Wahl., was recently detected, in excel- 
lent condition, on stones not far from the sea, at Nantasket beach, and also at 
Weymouth (Mr. Willey). Iam unable, at present, to examine a large collection 
of specimens of maritime Verrucarie of the maura-stock, made by me, the past 
season, on the coast of Maine; but have little doubt that we possess all the pub- 
lished European forms. 
