404' 
FLORA OF ADEN. 
subglauco-albidus, madefactus paullo perlucens, infra pi. m. dilute 
ssordide ockraceus, K H O adh. extus et intus lutescens. 
Cortex superior subordinate cellulosus ad 20 crassus. Cortex 
inferior indistinctus, rbizinae nullae. Lobi primarii ad 3-4 mm longi 
et ad 0 2 mm crassi, marginem versus delatati et cum ramulis ad 
3-3*5 mm. lati, plani centroversus h. i. paullo convexuli, ter v. quater 
subdicbotome ramosi, rami contigui et ad apicem dilatati et. pi. m. 
crenato-incisi. Soralia tenera, subrotunda et marginata vel elongata et 
confluentia in partibus adultioribus rariora adsUnt ; soredia alba. 
Apothecia desunt. Pycnides punctiformes (0*15 mm. It.), paullo emer- 
gentes, nigrae, madef. fuscescentes. Fulcra parmelioidea minora, saepius 
pauci-articulata. Pycnoconidia baoillaria recta 5*5-9 /ut longa et ca. 1 
fi crassa, obtusa. 
Locality : — On lava of Skum Shum Range (Simony). 
Physcia tribacia Nyl. FI. (1881), p. 537. Ach. Univ. (1810), p. 
415 (sub Lecanora). 
Description : — P. crusta imbricata albo-incana subtus subfibrillosa, 
lobis irregularibus diffiorinibus eroso-crenulatis, apotheciis adpressis, disco 
piano pallido in ambitu demum crenato lobato, margine tballode elevato 
persistente. 
Locality : — On lava of Shum Shum Range (Simony). 
Distribution Ad truncos arborum et in saxis Helvetia, Anglise. 
Ramalia farlnacea Ach. Univ. (1810) p. 606. 
Parmelia farinacea Ach. Meth. Lich. 263. 
Lichen farinaceus Linn. S. N. 
Lichen rostratus femina Scop. FI. Carn. 378. 
Description : — R. thallo tereti-compresso glabro sublacunoso 
soredifero rigido ramoso albo subeinerascente, ramis lineari-attenuatis, 
apotheciis sparsis pedicellatis planis subimmarginatis albidis. 
Locality : — On lava of Shum Shum Eange (Simony). 
Distribution Ad arborum truncos et ramos in Europa. 
Caloplaca (Amphiloma) lobulascens Stnr. Denkschr. Wiener. 
Akad. vol. 71 (1907), p. 95. 
Description 1 Thallus irregulariter vel interrupte suborbicularis v. 
fere expansus, squamae parvae ut in Cal. lobulata formatae etiamque h. i. 
coralloideo-granulosae, sed siccae albescentes, pallide ochraceae v. pallide 
lutescentes, madef. distinct© lutese et K H O adh. maculatim intus 
purpurascentes. Apothecia parva ad 0‘5 mm. lata v. saepius minora, 
primum concava et thallo marginata, deinde saepe paullo convexula, 
