361 Transactions. — Botany. 



thallinum cinctum. Sporce uniseriales, incolores, ellipsoidese, simplices evl 

 perraro biloculares, longit. 0*013 mm., crassit. 0-008 mm. 



Ad saxa. 



Thallus ashy-brown or ashy-red, closely adhering to matrix, tesselato- 

 areolate, areolae depressed in centre, divided towards circumference into 

 laciniae, lacinise expanded, wing-like, Cephalodia dull yellow or yellowish-red, 

 at length split into rays. Apothecia yellowish-brown, concave. Proper 

 excipulum surrounded by thalline border. Spores in a single row, colourless, 

 ellipsoid, simple, or very rarely 2-celled, 0*013 millim. long, 0*008 millim. 

 thick. 



Syn. Squamaria thaumasta, Stirton. 



Section of apothecium shows the proper excipulum of a pale colour, bound 

 by a thalline border. 



20. Squamaria perrugosa, Nyl., var. neglecta, Knight. 



Thallus cinereo-albescens, granulato-verrucosus, crustaceo-adnatus, centro 

 confusus, versus peripheriam lobulo-crenatus vel pterygioideo-expansus. 

 Apothecia rosea, farinosa, margine thallino crasso, tumido, farinoso, obsolete 

 crenato cincta. Cephalodia convexa, irregulariter fissa. Asci prcelongi, 

 angusti. Sporce uniseriales, octonse, ellipsoidese, simplices, pellucidse, longit. 

 0*027 mm., crassit. 0*013 mm. 



Ad saxa. 



Similis L. perrugosce, sed sporis subgrandibus facile ab eo distinguitur. 



Thallus greyish- white, granulate with warts, closely attached to matrix, 

 centre confused, towards circumference lobulato-crenate, or outspread wing-like. 

 Apothecia rose-coloured, farinaceous, bordered by a thick, swollen, obsoletely 

 crenate margin. Cephalodia convex, irregularly split. Asci very long and 

 narrow. Spores in one row, ellipsoid, simple, pellucid, 0*027 millim. long, 

 0-013 mm. thick. 



On rocks. 



Differs from the typical form in the larger size of the spores, and the 

 characters of the thallus. 



Lecidea campylospora, Stirton, is the Lecanora taitensis, Mont., as determined 

 for me some years since by Dr. Nylander. 



Lecidea maculosa, Stirton, is the L. leucoplaca } Chev. ; L. premnea, Fries. ; 

 Z. grossa, Nyl. in lit*. ; i. melastegia, Nyl. Leighton's Exs. 90 ! 125 ! 



Melaspilea amphorodes, Stirton, is the M. metabola, Nyl. Syn. Lich. Nov. 

 Cal. p. 69. 



Lecidea (Lecanova ?) imjMcata, Stirton, is the Lecanora thelotremoides, Nyl. 

 in litt. 



Astrothelium prostratum, Stirton, is the A. ochrocleistum : Nyl. in litt. 



