500 A. Engler, Beiträge zur Flora von Afrika. LIL. 
es sich um eine konstante Varietät oder um eine Kümmerform handelt. Für die letztere 
Annahme spricht, daß auf derselben Sandsteinplatte auch andere Flechten (Acarospora 
tersa und mehrere Parmelien) nur kümmerlich entwickelt wachsen. 
Acarospora capensis A. Zahlbr. nov. spec. — Thallus crustaceus, — 
uniformis, tenuis vel tenuior, parce areolatus,\areolis cinereoalbis, pruinosis, 
madefactis obscure plumbeo-vinosis, KHO —, CaCl,0, —, parvis, 0,5—0,6 mm 
latis, plus minus angulosis vel anguloso-rotundatis, areolis marginalibus 
magis squamaeformibus, sorediis et isidiis destitutis; cortex 12—48(20) y 
crassus, obscure fuscus, intus plus minus pallidior, ex hyphis plectenchy- 
maticis contextus, subcellulosus (cellulis subcubicis), non inspersus, strato 
9—16 u crasso, pallido, granose insperso, ex hyphis plus minus longitudi- 
nalibus formato, mox emoriente supertectus; stratum gonidiale 50—60 u 
crassum, bene elucens, continuum; medulla cinerascens, saepe fusco-in- 
spersa, in partibus obscuratis granose inspersa. — Apothecia immersa, 
minuta, ad 0,3 mm lata, simplicia, badia, nuda, madefacta cinerascenti- 
fuscescentia, plana vel planiuscula; excipulum ad latera hymenii tantum 
evolutum, incolor; epithecium fuscescens; hypothecium ex hyphis intricatis 
formatum, incolor, strato gonidiali non superpositum; hymenium sat humile, 
70—76 u altum, non coloratum, I mediocriter coerulescens, demum luteo- 
viride vel in luteo-fuscum vergens; paraphyses filiformes, supra sensim in- 
crassatae, septatae; asci subellipsoideae, ad 65 u longae et ad 18 y latae, 
myriosporae; sporae simplices, incolores, ovales vel late ellipsoideae, mem- 
brana tenui cinctae, 4—5 y longae et 1,5—2 u latae. — Conceptacula pycno- 
conidiorum immersa, ellipsoidea vel orchidiformia; perifulcrium sat crassum, 
pallidum; pycnoconidia oblonga, utrinque retusa, recta, 2,5—3,5 u longa 
et 0,8—0,9 u lata. 
Kapland: Matjesfontein im grofen Karroo, auf Sandstein (BRUNNTHALER). 
Acarospora deserticola A. Zahlbr. nov. spec. — Thallus sulphureo- 
luteus, lucidulus, epruinosus, madefactus non mutatus, KHO —, CaCLO, a 
irregulariter et late expansus, usque 8 cm latus, substrato bene adhaerens, 
tenuis, 0,4—0,7 mm crassus, irregulariter areolato-subsquamulosus vel areo- 
lato-diffractus, areolis contiguis, polygonis, 0,4—1 mm latis, planis vel in 
centro spurie impressis, superne laevigatis, subtus dilute ochraceis, sorediis 
et isidiis destitutis, solum superne corticatus, cortice flavo, dense insperso, 
34—38 u crasso, ex hyphis ramosis et intricatis formato; stratum goni- 
diale subcontiguum, crassiusculum, gonidiis numerosis, pleurococcoideis, « 
globosis 7,5—13 u latis, membrana tenui cinctis; medulla alba, inferne 
subochracea, KHO —, CaCl,0. —, KHO + CaCl,0, dilute rubens, imprimis 
in parte inferiore. — Apothecia in areolis thallinis normaliter solitaria, 
rarius 2—3, immersa, primum punctiformia, mox irregularia, utplurimum 
elongata, linearia, subrecta, curvata vel in uno apice furcata, disco nigri- 
cante, madefacto fusco, epruinoso, opaco, impresso, angusto, 0,17—0,19 mm 
