12 OTTO V. DARBISHIRE. [SEC. ARCT.EXP.FRAM 



tundatis, hyalinae, 1520 X 7 10 mi. magnae. Spermogonia non visa. 

 Habitat ad saxa, terram nudam et supra muscos Americae Arcticae. 



Notes: The new plant before us is very striking in appearance, 

 and I think there can be no doubt that it is nearly allied to Placodium 

 elegans, thus it resembles "Lecanora elegans (Acn.) f. muscicola, in 

 H. LOJKA, Lichenes Regni Hungarici Exsiccati. Fasciculus 3. (1882). 

 n. 120." But the latter has smaller spores (up to 14 mi. in length only) 

 and the margin of the apothecia is more marked. Our new species 

 often becomes almost fruticulose. Portions of the thallus stand up like 

 the upright podetia of Dadylina arctica. But they are much smaller, 

 about 1 cm. in height, and they are always dorsiventral in structure. 

 Apothecia seem to be rare, some specimens being quite devoid of such. 

 The complete absence of rhizines at once separates this species from 

 any kind of Xantlioria. 



Aspicilia lesleyana. (Tab. 2, fig. 2). 



Diagnosis: Crusta tenuis vel crassiuscula, albo-cinerascens aut 

 dilute roseola, rimoso-areolata vel rimoso-diffracta, margine quasi effi- 

 gurato, frequenter non-contigua, hypothallo nigro veil pallido. Apothecia 

 ad 1 mm. lata, primum immersa, urceolata, dein emersa, semper mar- 

 gine distincto cincta, atra, pruinosa; epithecium nigrum; sporae octonae, 

 hyalinae, 15 X 7.5 mi. magnae. Habitat ad saxa. 



Notes: The species of Aspicilia are common enough in the 

 "FranV'-material, but they have given me a great deal of trouble. I consider 

 however this to be a new species, though not unlike Aspicilia calcarea, 

 (L.) SMRFT. The latter however has fewer, but larger spores in its asci. 

 The thallus of our new species is distinctly areolate and near the mar- 

 gin it breaks up almost into long thin laciniae, still distinctly areolate. 

 The thallus often consists of only one fertile wart. The hypothallus is 

 as often clearly marked as not present. 



i 



Aspicilia nikrapensis. (Tab. 2, fig. 3). 



Diagnosis: Crusta tenuis aut crassiuscula, tartarea, albo-ciner- 

 ascens, conligua, centro inter apothecia matura distincte rimoso-areolata, 

 margine fenui, quasi effigurato, hypothallo nigro aut nullo distincto. 

 Apothecia primum immersa, demum emersa, disco planiusculo, pruinosos 

 margine distincto instructa; sporae octonae, 10 20 X 7 8 mi. magnae. 

 Habitat ad saxa. 



