The Scottish Naturalist. 219 



Ad terram basi Ben Lawers. 



The blue stratum above the hypothecium disappears here and 

 there, and nitric acid applied gives at first a violaceous tint, 

 which ultimately vanishes. The hymeneal gelatine is rendered 

 blue, then opaque, by Iodine. 



Lecidea recensa, sp. n. 



Thalltis albus vel albidiis convexo-areolatus {areolis appositis vet dispersis) ; 

 apothecia scssilia nigra plana nigro-inarginata {viargine plcrumque undtdato) 

 parva, scspissime aggregata ; spores Snce incolores simplices oblongce cvrvatce vel 

 arcuatce^ .01 - .014 x .0035 —.0045 ;//;;/.; paraphyses nonnihil irrcgulares cras- 

 siusculcB apicibiis clavaitilis fuscis ; hypothecium incolor. lodo gel. itym. cceru- 

 lescens {saltern leviter). 



Saxicola (Craig Var). 



This may be a form of L. rivulosa, but the spores are thinner 



and more curved, the apothecia black, and thallus white, &c. 



Lecidea amphiplecta, sp. nov. 



Similis L, furvellfe (Nyl,), sed hypothecio incolore et iodo gel. hym. obso- 

 lete cczriclescente dein vinose rnbente vel interdum vinose riibescente. Paraphyses 

 confert(S et quasi reticulatcz, epithecium crassttm ficsco-nigruin conglutinatuju. 



Saxicola (Ben Lawers). 



K renders the paraphyses more distinct, when they are seen 

 as irregular, disjointed, or nearly moniliform threads. 



Lecidea mersata, sp. n. 



Thallus pallidus vel pallide glaucescens interdum rufo-ferrugineiis, tenuis 

 fere continuus Icevigatus, hinc inde rimuloso-areolatus [K— C— ) / apothecia 

 adnata nigra majuscula plana anguste inarginata, demum convexula et fere 

 immarginata, intus C(jerulescentia prcesertim supra ; sporce hicolores, simplices ^ 

 ellipsoidece vel scepius fiisiformi-ellipsoidea:, .022 — .036 x .008 — .01 1 mm.; para- 

 physes distinct(B fliformes, crassce {crasit. .0025 — .003 mm.), apicibus late 

 ccBrulescentibus, vix clavatulis, discretis ; hypothecium crassum fusco-nigrum. 

 Iodo gel. hym. intense ccerulescens, tkecce interdum fulvescentes. 



Ad saxa submersa lacus Rannoch. 

 Affinis L. cyanophthabiKZ (Nyl.) 



Lecidea das^a, sp. n. 



Thallus fuscus vel fusco-niger, laxe adhcerens, mollis, granulato-ftcrfuraceics 

 vel isidioideus, diffracto-areolatus fere sicut in L. furvella (Nyl.), sed nonnihil 

 tenuior et inagis dispersals ; apothecia fusco-nigra vel nigra parva {la tit. .2— .3 

 mm.), concaviuscula, acute marginata demum planitcscula margine depressulo, 

 intus rufo-fuscescentia ; sp07'<z Sms incolores sphcericce simplices scEpe nucleatce, 

 diam. .0035— .0045 mm.; paraphyses irrcgulares non distinctce apicibus con- 

 coloribus non clavatis ; hypothecium obscurius vel rufo-fuscum. Iodo gel. hyvi. 

 non mutata. 



