248 Dr. Nylander on Lichens in the Luxembourg Gardens. 
incoloria vel livido-pallida leviter albo suffusa minora, sat 
conferta, margine thallino albo opaco subintegro vel obsolete 
crenulato cincta; spore: 8, ellipsoidee ; paraphyses haud bene 
discrete. 
Ad lapides murorum. 
LL. dissipata (comparanda cum L. dispersa) differt ab L. 
urbana hypothallo, apotheciis dispersis minoribus, paraphysi- 
bus vix articulatis et minus bene discretis (addito ammoniaco 
distinctiores et evidentius articulate conspiciuntur). Gel. 
hym. in omnibus tribus similiter iodo tingitur et gonidia in iis 
abundantia sub apothectis. 
21. Lecanora parisiensis, Nyl. n. sp. (vel potius var. L. sub- 
fusce). 'Thallus cinereus, mediocris, rugosus vel rugoso- 
granulatus vel subverrucosus, sat determinatus, hypothallo 
non visibili ; apothecia nigra vel fusco-nigra vel rarius fusca, 
nuda (interdum leviter cesio-pruinosa), mediocria, planiuscula, 
margine thallino rugoso vel. subcrenato cincta, strato subja- 
cente gonidico lete viridi; spore 8, ellipsoides ; paraphyses 
distincte articulate, apice leviter incrassate, et sat late fusces- 
centes. Gel. hym. iodo cxrulescens (deinde thece vulgo sole 
sic vel nonnihil violaceo tincte). 
Ad corticem presertim esculorum. K+. 
Differs from all varieties of L. subfusca by its thick articu- 
late paraphyses, but chiefly approximating var. allophana, Ach., 
which has larger spores and slenderer paraphyses. 
22. Lecanora scrupulosa, Ach., Nyl. Scand. 162. Gel. hym. 
iodo vinose rubens. K+. 
23. Lecanora umbrina (Ehrh.), Ach., Nyl. J. ¢. (forma cya- 
nescens, Ach.), K—. 
Note.—Lecanora Flotowtana, Anz. Manip. 53=L. umbrina 
saxicola = Lecidea pelidna, Ach. K-. 
Lecanora Sommerfeltiana, Krb. Lich. Sel. 99 =L. crenulata, 
Dicks., Nyl. L. Par. 123; Heppe, 63. K-—. 
Saar e Sommerfeltiana, Heppe, 61=L. dispersa, Pers. 
24, Lecanora erysibe (Ach.), Nyl. Scand. 217. 
25. Lecanora depressa (Ach.), var. calcarea (L.), Nyl. 0. ¢. 
154. 
26. Lecidea parasema, var. enteroleuca, Ach., Nyl. /. c. 217. 
Etiam f. synothea, Ach. 
27. Lecidea albo-atra, var. athroa (Ach.), Nyl. J. c. 235. 
28. Arthonia tenellula, Nyl. in Flora 1864, p. 488. Vix 
nisi var. A. patellulate, Nyl. Scand. 262. 
29. Verrucaria sorediata, Bory. (V. Garovaglit, vay. incrus- 
tans, Nyl. Prodr. Gall. 179, Pyrenoe. 20). 
30. Verrucaria virens, Nyl. Pyrenoc. 25, Scand. 270, var. 
obfuscans. 
