Dr. E. Stizenberger on the Saxicolar Species of Opegrapha. 439 
Graphis saxatilis, Wallr. O. saxatilis, Leight., Korb. (incl. 8. pruinosa), 
Arn., Mudd. O. lithyrga, Moug.-Nest. O. Mougeotii, Mass. Anzi, 
Venet. O. saxicola, B. amylacea, Mass. Anzi Venet. O. Korberiana, 
Mill. O. pruinosa, Hepp. Herb. Exs. Moug.-Nest. 856; Zw. 2. 1458; 
Rbh. 620; Anzi, Longob. 407, Id. Venet. 103, 106; Hepp. 765 (ined.). 
Thallus effusus, farimoso-pulveraceus vel tartareus, tenuior vel rarius 
crassior, imo tuberculoso-areolatus, albus (seepius algis conspur- 
catus), raro deficiens. Apothecia sparsa vel cumulata, majora (ad 
2°5 millim. longa, 0°5 millim. lata), elongata, utrinque attenuata, 
recta vel curvula vel plicata, simplicia, raro ramulo laterali nigra ; 
epithecio primum rimiformi, dein dilatato, plano, albo-ceesio- vel 
viridi-pruinoso vel nudo, margine subpersistente. Hymenium 
hyalinum (60-100 mik. altum), superne fuscatum, in hypothecio 
denigrato, e paraphysibus capillaribus sat distinctis et ascis clavatis 
60-80 mik. longis) compositum. Spore 8®®, crasse fusi- vel 
claviformes, 5- rarius 3—7-septatis, eetate fuscee (20-32 mik. longe, 
6-8 mik. late), seepe halone involute. Hymenium tinctura iodii 
vinose rubens. Spermogonia nigra, punctiformia. Spermatia 
cylindrica, in sterigmatibus setiformibus (5 mik. longa, 1 mik. 
crassa). 
In rupibus calcareis vel arenaceis, tegulis, raro in rupibus azoicis et 
in terra argillacea Italiz, Helvetice, Germanie, Galliz, Angliz, 
Suecize meridionalis. Interdum in Rubos et Hederas trans- 
migrans. 
B. Species saxicole, sporis 4-locularibus. 
5. Opegrapha atra, var. calcarea, Turn. Ach. non Aut. 
O. saratilis, Fr. p.p. 
Thallus pulveraceo-tartareus, rimuloso-areolatus, albus. Apothecia 
sessilia, elongato-elliptica, utrinque obtusa, recta, nigra, opaca, 
stellatim conferta (vix 1 millim. longa, 0-2 millim. lata); epithecio 
anguste rimiformi, margine tumido. Hymenium (ca. 60 mik. 
altum) hyalinum, in hypothecio nigro-fusco, ex ascis pyriformibus 
(35-50 mik. longis, 18 mik. latis) pariete apicali incrassato et 
paraphysibus distinctis compositum. Sporze 8°, elongato-ellipticee 
vel solezeformes, 3-septatee, hyalinee (14-16 mik. longze, 4—5 mik. 
crass). Hymenium tinctura iodi cerulescens. Spermogonia 
nigra punctiformia. Spermatia tenella, recta (5-6 mik. longa, vix 
1 mik. crassa). 
In rupibus calcareis Gallize et Angliz. 
f. tenuior, Nyl. sec. spec. miss. 
Apotheciis gracilioribus linearibus differt. Sporze et spermatia sicut 
in typo. 
Ad Oran in Algeria. 
Var. trifurcata, Hepp. 
O. trifurcata, Hepp. in Miill. Genev. p. 67. O. exilis, Garov. in hb. Zw. 
O. confluens, Hepp. Arn. in hac Flora. Arthonia confluens, Korb. Pg. 
Thallus tenuis, tartareus, continuus, albus. Apothecia insulari- 
