; 


. 83 
_ ern Cuba; Mr. Wright. In defining the spores of O. 
. prosodea, Ach., Nylander (Lich, Exot, p. 229, note) 
eompares the lichen generally (as represented in the 
se herbarium of Acharius) to the O. rubella of Mongeot 
& Nestler's Zvsiccati, which he has since indicated is 
~ the Q. viridis of Persoon; as it is also, in part, of 
\ Ploerke’s herbarium. I am inclined to consider this 
_ a bappy comparison, in view of the extension of the 
_ Acharian species above-proposed ; and to regard our 
, Temarkable a as related tod much in the same way 
that O. involuta, Wallr. is to the more narrowed forms 
» (as Zw. exs. n. 8; Stenh, Lich. Suec. n. 119, pro min. 
. p.) of O. viridis. The spores of the two northern 
, lichens last referred to are as similar as those of the 
tropical ones described above, and Scherer well 
united the northern forms in his n. 96; the left-hand 
_ Specimen, in my copy, offering the short, often con- 
eave, thick-margined fruit of O. involu(a, and the 
right, the more elongated, slenderer apothecia of O. 
rubella, Nyl. Prodr. The now rounded apothecia of 
our above-described vy. notha accompany sometimes, 
and significantly resemble Lecanactis premnea, 
Oprcrarna astra (sp. nova) thallo compacto cineras- 
cente albidove 1. obsolescente, nigro-limitato ; apotheciis 
éuperficialibus deplanatis abbreviatis 1. elongatis sim- 
plicibus l. demum stellato-ramosis, diseo puneti- lL. rim- 
@formi margineque demisso albo-velatis. Spore in the- 
cis confertis clavalis octcnz, dactyloidee, 4—8-blastee 
sporoll. quadratis, dan. 5—7 plo longiorce, plerumque 
incolores. 
a, apotheciis rotundie ellipticisve dein elonga!is sim- 
: plicibus margine nigro subpersistente. 
b, apotheciis moz stellatis superne aldo-vestitis. Gra- 
