Bd. IV: il) TUE LICHENS. II 



Aspicilia orbiculata nov. spec. 



(Plate 2, fig. 21.) 



Thallus sordide albidus, profunde diffractus et tuberculato-granulosus; tubercula 

 ad I mm lata; K minime flavescens; hypothallus nullus distinctus nisi alios Hellenes 

 tangens et dein nigricans; apothecia semper immersa, regulariter rotundata; epithe- 

 cium nigricans, planum, epruinosum; amphithecium marginem thallinum producens 

 bene distinetum; parathecium pallide fuscescens et etiam hypothecium; paraphyses 

 apieibus incrassatis, simplices; sporae octonae, hyalinae, unicellulares, subrotundatae, 

 9 — iox6 — 9 ii magnae; spermogonia et soralia nulla visa; habitat ad saxa, Falkland 

 Islands, Port Louis. 



Notes: The feature of this species is the very regular round shape of the apo- 

 thecia which possess a very dark epithecium. The thallus itself is of a very deeply 

 chinked nature and it is practically broken up into a number of granular tubercles. 

 Another feature of great interest is the shape of the spores which are very nearly 

 quite round. The hypothallus is often itself not coloured but it forms a black ridge 

 when our plant comes into contact with another lich°n-thallus. 



Pannoparmelia (MCll.-Arg.) Darbish. 



Thallus foliaceus, anguste laciniatus. Gonidia protococcoidea stratum continuum 

 formantia sub cortice superiore. Stratum medulläre inferius pannosum, ex rhizinis 

 constitutum crassis et multicellularibus transverse et longitudinaliter. Apothecia par- 

 melioidea. Sporae octonae. 



Pannoparmelia anzioides nov. spec. 



(Plate 2, fig. 22). 



Thallus albido-flavens, prostratus, laciniatus, K — ; laciniae 0.5 — 1.0 mm latae, api- 

 eibus non moniliformitcr constrictis; cortex superior 50 — 60 \i crassus, ex hyphis 

 constructus superficiel perpendicularibus, 4 — 5 /< latis; medulla ex duobus partibus 

 constructa; pars superior 30 — 50 u crassa, laxior, hyphis instructa 5 — 6 /( latae; pars 

 inferior medullae 40 — 60 ,u vel ad 0.1 mm crassa, ex hyphis constructa valde congluti- 

 natis, 6 mm u crassis; gonidia stratum formantia ad 50 — 60 ju crassum, protococ- 

 coidea, subsphaerica, 6 — 10 /.i crassa; cortex inferior 20 — 60 a crassus, valde conglu- 

 tinatus, obscurior, ex hj'phis constructus hypothallum formantibus ad 150 /< crassum; 

 hypothallus ex fasciculis constructus anastomosantibus hyphorum valde conglutinatis, 

 nigricantibus, 20 /( longis sed contortis, 8 — 10 ft crassis; fascicula 8 — 10 a crassa; 

 apothecia parmelina, ad 6 mm lata, epithecio rufo; sporae octonae, simplices, ro- 



