' DUKIKG THE ^ CHALLEXGEB ' EXPKDITIOIT. 213 



crassit. 0004/-0006 millim. ; paraphjses graciles apice granuloso- 

 inspersse. lodo gelatina Lymenialis caerulescens, caerulescentia 

 dein subpersistens (tbecse ssepe subviolascentes), 



"Affinis videtur Lecanorce subcarnece, Nyh A L. Bogotana pal- 

 lidiore distat paraphysibus gracilentis* Spermogonia non visa." 



■Nyl. in litt. 



On rocks, St. Vincent : very sparingly seen. 



17. DiEiNA EEPA]S"DA, var. {^^Lecidea teicModes^ Strn., sp. n.]. 



On rocks, the only specimen seen being sterile. This is cer- 

 tainly not a Lecidea^ but a Dirina^ as is sufficiently shown by the 

 characters of the thallus and the spermogones. It appears to be 

 a var, of _D, repanda^ approaching to seldstosaj Bagl. (vid. Nyl- 

 Pyr. Or.) ; but as no apothecia are visible on the specimen re- 

 turned, this is somewhat uncertain. 



18. Peetusaeia aleianta, JSfyh^ sp. n. [=P. leioplaca]. " Thal- 

 lus albidua opacus, mediocris crassitiei (1 millimetri vel multo 

 quidem tenuior), ina^qualis, rimoso-diffractus K(CaCl) — ; apo- 

 thecia (in verrucas tliallinis convexis insequalibus variisque, 1-3- 

 hymeneis inclusa) extus supra puncto obscure ostioli demum iu- 

 dicata K(CaCl) -; sporce 2'4n^, longit. 0'070-0-090 millim., 

 crassit. 0033-0038 millim. lodo thecae intensive caerulescentes. 

 Verrucse thallinae apothecia continentes plus minusve erainulse et 

 distlnctae, interdum subconfluentes. Spermatia acicularia recta 

 longit. 0-010-0-012 millim., crassit. 0^0005 millim., utroque apice 



acutata. 



'^Comparetur P. impallescens^ Nyl., ex insula Rodriguez. 

 -A^Z. in lilt. 



On rocks : sparingly seen. 



19. Lecidea canescexs (Dcks.). 

 On rocks: sterile, associated with Collemopsts pelia. (Thallus 



K+ yellowish, CaCl-.) 



20. L. EPiPASTA, 8trn.^ sp. n. (Nomen valde ineptum, nam nihil 

 *' effusum " adest : melius forte dicatur L, epiplacodia, Cromb.) 



On rocks : parasitic on the thallus of Lecanorajlavorubens. 



(This species is in a certain way allied to L. parasitica ; but the 

 spores are colourless, normally 3-septate, 0-018-0-022 millim. long, 

 00035 millim. thick; and, what is of greater importance, the 

 Spermatia are arcuate as in the section of L. aromatica^ to which 

 consequently it belongs. It is there analogous to Lecidea viteU 

 linaria in the section of L. parasema,) 



lilNN. JOUEN. — BOTAXT, VOL. XVI. B 



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