76 
variabilia, e suborbiculari oblonga, angulosa, depauperato-astroi- 
dea v. longiora et linearia, hinc inde bifurcata, aut opuntioideo- 
inaequalia, sieca nigrescenti-fusca et partim obsolete thallino- 
velata, madefacta pallidius fusca; epitheciun fuseidulum; 1a- 
mina et hypothecium hyalina; asci oblongato-obovoidei, 8-spori; 
sporae hyalinae, fusiformi-oblongatae, 6—8-loculares, loculi ul- 
timi reliquis longiores sed iis angustiores. — Habitu et cha- 
racteribus ad A. conferlam Nyl. Enum. gen. p. 132 (a qua non 
differt A. substellata Nyl. Prodr. Nov. Gran. p. 106) accedit, sed 
apothecia fere simplicia, longe minus astroideo-raıosa, asci oblon- 
gati et sporae longiores, ambitu angustiores. —- Corticola prope 
Lydenburg in Transwaalia: Dr. Wilms (comm. Dr. Lahm sub 
n. 62). 
1097. Arthothelium albidum Müll. Arg.; thallus albus v. caesio- 
albus, tenuissimus, laevis, demum subfarinulentus; apotheeia 
leviter emergentia, sicca et madefacta nigra, opaca, !/,—'/, mn. 
lata, anguloso-oblongata, saepe 2—4-plo longiora quaın lata, 
curyata et irregularia v. breviter bifurcata; epithecium olivaceo- 
v. coerulescenti-nigrescens; lamina virenti-hyalina; hypothecium 
fuscidulum; asci globoso-obovoidei, 8-spori; sporae hyalinae, 
c. 28 u longae ct 12 u latae, oblongo-ovoideae, 6-loculares, lo- 
culi intermedii 2- (raro 3-) locellati. — Inter Arthothelium Becca- 
rianum Bagl. et Arthothelium ambiguellum, sc. Arthoniam ambiguei- 
lam Nyl. Prodr. Nov. Gran. p. 103 in vicinitate Arthotheli adve- 
mientis, s. Arthoniae advenienis Nyl. Syn. Lich. Nov. Caled. p. 63 
inserendum est. A proximo priore differt apothecüs distincte 
gracilioribus, epithecio coerulescente, sporis longioribus at mi- 
nus divisis. — Corticola ad Lydenburg in Transwaalia: Dr. 
Wilms (comm. Dr. Lahm sub n. 68). 
1098. Arthothelium obvelatum Müll. Arg.; thallus albidus, te- 
nuissimus, laevis, demum farinulentus; apothecia paullo emer- 
gentia, 1/,—!/, mm. lala (et ıninora), subinde confluentia, angu- 
loso-orbieularia v. subregularia, convexula, nigra, ob vestimen- 
tum tenue thallinum griseo-nigricantia v. centro demum nudata; 
epithecium olivaceo-nigricans; lamina virens; hypothecium hya- 
linum ; asci subglobosi, 8-spori ; sporae hyalinae, 28—35 u longae, 
13—15 u latae, ovoideae, erebre 12-loculares, loculi intermedii 
in junioribus dense approximati, i. e. ultimis multo breviores, 
evoluti demum 2—3-locellati. — Extus macram simulat Poly- 
blasliam lacteam Mass., et juxta Arthothelium emersum Müll, Arg. 
