404 PROCEEDINGS OF THE AMERICAN ACADEMY 



elegant specimens, collected by Mr. Wright, from stems of Pandanus, 

 in the Bonin Islands (Herb. U. S. N. Pacif Expl. Exp.), with linear, 

 elongated, discrete lobes, which are brought into relief by the black 

 hypothallus, have just the marking above described, and the regular 

 soredia, and whole asyect oi Pyxine ; but are without fructification. 



Pannaria leucosticta, Tuckerm. in litt. : thallo e squamulis 

 cartilagineo-membranaceis glauco-fuscescentibus ambitu expansis sub- 

 elongatis pinnato-incisis centro adscendentibus imbricatis dissectis 

 dentato-crenatis, crenis albo-pulverulentis, hypothallo creruleo-nigro 

 marginante ; apotheciis appressis convexis rufis margine thallino 

 persistente subincurvo crenulato mox pulverulento. Sporoe ovoidete, 

 simplices, incolores, diam. 1^-2-plo longiores. — Parmelia (Psoromci) 

 leucosticta, Tuckerm, in Darlingt. Fl. Cest. p. 441. On trees and 

 rocks. New England to Virginia, not uncommon. Pennsylvania, Dr. 

 Michener. North Carolina, Rev. Dr. Curtis. South Carolina and 

 Georgia, Mr. Pavenel. Alabama, Mr. Beaumont. Louisiana, Dr. 

 Hale. Approaching P. microphylla, from which it differs in the colors, 

 in its larger, dissected thallus, and also in the apothecia and spores. 

 And it also approaches (but is always, so far as I have observed, dis- 

 tinguishable from) subsquamulose states of P. ruhiginosa. P. cras- 

 pedia, Koerb. Parerg. 1, p. 45 (1859) from Istria, appears to have 

 some (possibly unessential) features of agreement with our Lichen. 

 But it is interesting, in this connection, that one or two other Lichens, 

 first observed in North America, as Cetraria Oahesiana ( C. Bavarica, 

 Krempelh., and now published also, though I know not from what 

 locality, in Massalongo's Italian Herbarium Exsicc), and possibly 

 Physcia ohscura, var. erythrocardia {Parm. stuppea, Tayl., which can 

 hardly be distinct from P. endoccina, Koerb. 1. c. p. 36, from Tyrol), 

 are, with more or less certainty, inhabitants of the South of Europe. 



Pannaria crossophylla, sp. nov. : thallo minusculo membranaceo 

 glauco-cinerascente e squamulis subelongatis expansis plumoso-multi- 

 fidis, lobulis linearibus teretiusculis subtus subconcoloribus ; hypothallo 

 nigro obsolescente ; apotheciis appressis convexis rufo-fuscis biatorinis 

 vel excipulo thallino (spurio) tenui crenato demum subcinctis. SporjB 

 ellipsoidece, limbata3, subincolores, diam. mox 4-plo longiores. — On 

 slaty rocks, Brattleborough, Vermont, 3fr. Russell. This Lichen, of 

 which I have also received fine specimens from Mr. Frost, appears to 

 differ from all described species in the narrow, teretish divisions of its 



