370 BOTANY OF SOCOTRA. 



d. var. oblongata, Mull. Arg. in Proc. Koy. Soc. Eclin. xi. (1882), 464. 



Thallus (in ramulifl decorticatis) cum fibris ligni commixtus maculam laevem albidam formans; 

 apothecia parva, nonnulla orbicularia, *• rnm. lata, adpressa, prominenter inarginata, plana 

 et nuda, reliqua numerosiora circ. triente longiora quam lata v. subinde duplo longiora 

 quani lata, sensu fibrarum ligni oblongata. Sporae 14-16 jul longae, 7|— 8£ /j. lata?. 



Forma microcarpa habitu ad Buelliam Bicasolii, Mass. accedens, sed hypotheciuni crassum 

 fuscum valde differt. Apothecia nascentia s. potius e ligno egredientia omnia modice 

 compressa sunt. Gonidia dein vera sunt nee cbroolepoidea et omnia cum genere Buellia 

 quadrant. Cseterum etiam in B. parascma, De Not. var. saprophila, Korb., europaea etiam 

 bine inde apothecia pauca immixta nonnihil oblongata observavi. 



Socotra. Ad ramulos siccos decorticatos supra Wadi Kischen, alt. 

 600 m. Schweinf. 

 Distrib. Endemic. 



2. B. brachyspora, Mull. Arg. in Proc. Koy. Soc. Edin. xi. (1882), 464. 



Apothecia parasitica, superficialia, £-1 mm. lata, tota nigra, depresso-plana, prominenter mar- 

 giuata, margo integer et nitidulus, discus planus, nudus, opacus ; lamina circ. 40 p. alta, 

 hyalina ; epithecium fuscum ; hypothecium superne byalinum, caeterum profunde atro- 

 fuscum, paraphyses fusco-capitulatae. Sporae circ. 6-nae., 7-9 /u. longae, 4^-6| /m lata?, latiua- 

 cule ellipsoideae, utrinque late rotundato-obtusae. 



Apothecia ut in B. athallina, Mull. Arg. et B. rimulicola, Mull. Arg., sporae autem ut in B. 

 leptolepide, Bagl. et Car. et B. vagante, Mull. Arg. 



Socotra. Crescit in thallo hinc inde evanescente Buettice innatce, Mull. 

 Arg. ad Wadi Kischen, alt. 600 m. Schweinf. 

 Distrib. Endemic. 



3. B. stellulata, Mudd Man. p. 216, var. protothallina, Mull. Arg. 



Lecidca stellulata v. protothallina, Krplh. Lich. Glaz. p. 40. 



Socotra. Ad saxa quartzosa. B.C.S. nn. 1404 pro parte, 1405 pro parte, 

 1408 pro parte. 



Distrib. Very common in tropical and subtropical regions ; less so in 

 temperate regions, extending northwards to Denmark and England. 



4. B. albinea, Mull. Arg. in Proc. Roy. Soc.Edin. xi. (1882), 464. 



Omnia ut in B. stellulata, Mudd. var. protothallina, Mull. Arg., sed areolae candide alba?, 2-3-plo 

 majores, hinc inde contiguoe, rugulosae, rimis atris segregatae et pro parte in hypothallo atro 

 dispersae. Apothecia primum albo-marginata, dein crebre diplotommoideo-crenulata, mox 

 nigra ; hypothecium longe pallidius, fuscescenti-hyalinum. Sporse 9 /x longae, 5 /x latae. 



Socotra. Ad saxa quartzosa. B.S.C. n. 1393 jpro parte. 

 Distrib. Endemic. 



