280 PROCEEDINGS OP THE AMERICAN ACADEMY 



It remains only to add, that specimens of most of the forms of the spe- 

 cies, as distinguished here, being sent (before pubhcation) to Dr. Ny- 

 lander, that eminent hchenist has published his own determination of 

 the same (in the place already cited under L. parvifolia), which should 

 be compared with the above. 



Lecidea (Bacidia) medialis, sp. nov. : thallo granulis cartilagineis 

 mox applanatis confluentibus diffracto-rimoso cinerascente cum hypo- 

 thallo pallido confuso ; apotheciis parvis plano-convexis e luteolo-pallido 

 rufescentibus margine obtuso dein evanescente. Sp. in thecis clavatis 

 suboctonaj, incolores, e dactyloideo-fusiformi bacillares, s«pius tetrablas- 

 t£e, diam. 5 - 10° longiores. Paraphyses mox distinctte. Trunks. In 

 Nicaragua (U. S. N. Pacif. Expl. Exp.) Mr. Wright, who also collected 

 it in Cuba (Lich. Cub. n. 203) . Properly a Bilimbia, but the distinction 

 between this group and Bacidia disappears in the lichen, which thus 

 curiously illustrates Fries's reduction of the European types of both 

 groups to a single species. I am at any rate unable clearly to dis- 

 tinguish the Bilimbia in Lich. Cub. n. 204, with dactyloid, quadri- 

 locular spores, very like those of L. sphceroides (Stenh. Lich. Suec. n. 

 54, b), but smaller,* and finally a little elongated, from the above- 

 described specimens ; which yet may otherwise easily be taken (though 

 differing apparently in the color of the thallus, and the smallness of the 

 apothecia, and diverging considerably in the spores) for a tropical va- 

 riety of L. (Bacidia) rubella. 



Lecidea (Bombyliospora) leptocheila, sp. nov. : thallo tenui 

 rugoso-verruculoso ex albido dein fuscescente hypothallo fibrilloso ni- 

 gricante sublimitato ; apotheciis mediocribus adnatis plano-convexis 

 disco fusco-nigro opaco marginem tenuem integerrimum concolorem 

 mox excludente. Sp. octonaj, sub-parva?, incolores, oblongo-ellipsoideae, 

 diblastae, dein obUqute, diam. 2-3^° longiores. Paraphyses conglu- 

 tinge. On trunks in the island of Cuba, Mr. Wright (Lich. Cub. n. 

 227). Distinct from L. endochroma (Fee), Nyl. (Wright Lich. Cub. 

 n. 226), in its differently colored thallus, now elegantly fi'inged by the 

 fibrillose hypothallus, thinner-margined apothecia, which are constantly 

 white and not yellow within, and in its smaller spores. It seems im- 

 possible to deny the near affinity of these two species to L. Taitensis 



* Not larger, as, lapsu calami^ they are said to be in the ticket of the cited speci- 

 men. The spores differ, therefore, from those of the Northern lichen just as the 

 spores of L. Icetior and L. subvernalis from those of L. vernalis . 



