34 LINDSAY, ON ABROTHALLUS. 



Paraphyses closely aggregated ; thickened^ deeply coloured, 

 and cohering at tlieir apices. Sjjores ovate-oWong and obtuse 

 at ends, or ellipsoid and acute ; two-locular — the loculi being 

 unequal in size, and the larger one always looking towards 

 the apex of the theca — or simple ; of an olive-green or 

 brownish colour, or pale ; frequently containing two or more 

 globidar nuclei. Sjjermogones immersed, spherical, one- 

 locular, opening by a point-like or stellate-fissured ostiole ; 

 envelope of a deep brown tint. Sterigmata simple, slender, 

 irregular ; generating from their apices only, linear, straight, 

 slender Bpermatia. Pycnides also immersed, spherical, one- 

 locular, opening by a simple or stellate ostiole, generally 

 larger and more conspicuous than the spermogones. Sterig- 

 mata short, simple, sometimes inconspicuous or absent ; 

 monosj)ored, generating from their apices, the stylospores, 

 which are pyriform or obovate, simple, pale, obtuse at ends, 

 and contain an oily protoplasm or distinct oil globules. 



Species I, — A. Sniithii, Tul. emend, (including the A. 

 Sniithii, A. Welwitzschii, and A. microspei'inus of Tulasne, 

 and the A. Bertianus and A. Buellianus, De Not. and 

 Massol. Eicerch., 88. Biatora ParmeViarmn, Fw., in litt. 

 Smmf. Lapp., 176 [sub. Lecid.] Encloc parasit., Ach., Syn. 

 100. Fw., L. E., 451). Apothecia ejuthalline, scattered, 

 rarely confluent, prominent, pulviniform or globose, normally 

 smooth and black, sometimes green-pruinose ; circumference 

 agglutinated or free ; idtimately falling out and lea^dng dis- 

 tinct cyphelloid foveolse, whicli have frequently raised and 

 dark margins. Hxjpothecmm olive-coloured. Thecce: amyloid 

 reaction with iodine feeble or none. Spores ovate-oblong 

 (Korber describes them as soleaeform or " schuhsohlenfor- 

 ning"), two-locular, upper segment broader and shorter 

 than lower, olive-green or brownish ; vary in size ; loculi 

 frequently containing one or two globular nuclei. Spermo- 

 gones absent. Pycnides abundant. 



'I. Var. ater. Apothecia black and smooth. {A. Sniithii, 



Tul. in part.) 

 /3. Var. pulveridentus. Apothecia sparingly or copiously 



green-pulverulent. {A. Sniithii, Tul. in part, and A. 



Welwitzschii, Tul. Leiglit. L. E. fasc. vi. No. 191.) 

 5. Var. niicrospermus. Spores small and pale. {A. niicro- 



spernius, Tul.) 



Habitats. — I. On furfuraceous ^tatc^ oi Parmelia saxatilis ; 



