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 ; sporae 8, ellipsoide^ ; paraph jses baud bene 

 discretae. 



Ad lapides murorum. 



L. dissijpata (comparanda cum L, dispersa) differt ab L. 

 urhana hypothallo, apotheciis dispersis minoribus, paraphysi- 

 bus vix articulatis et minus bene discretis (addito ammoniaco 

 distinctiores et evidentius articulatse conspiciuntur). Gel. 

 hym. in omnibus tribus similiter iodo tingitur et gonidia in iis 

 abundantia sub apotheciis. 



21. Lecanora parisiensiSj Nyl. n. sp. (vel potius var. L. suh- 

 fuscce), 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 csesio-pruinosa), mediocria, planiuscula, 

 margine thallino rugoso vel subcrenato cincta, strato subja- 

 cente gonidico laete viridi ; sporae 8, ellipsoideae ; paraphyses 

 distincte articulatae, apice leviter incrassatae, et sat late fusces- 

 centes. Gel. hym. iodo cserulescens (deinde thecae vulgo solae 

 sic vel nonnihil violaceo tinct^e). 



Ad corticem prgesertim aesculorum. K + . 



Diflfers from all varieties of L, subfusca by its thick articu- 

 late paraphyses, but chiefly approximating var. allophanaj Ach.j 

 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. I. c. (forma cya- 

 nescensj Ach.). K — . 



Note. — Lecanora Flotowianaj Anz. Manip. 53 =Z. umbrina 

 S8ixico\8i= Lecidea ^elid7ia J Ach. K — . 



Lecanora Sommerfeltianaj Krb. Lich. Sel. 99 =L, crenulata, 

 Dicks., Nyl. L. Par. 123 ; Heppe, 63. K - . 



Lecanora Sommerfeltianaj Heppe, 61 =L. dispersa, Pers. 

 K — . 



24. Lecanora erysibe (Ach.), Nyl. Scand. 217. 



25. Lecanora depressa (Ach.), var. calcarea (L.), Nyl. I. c. 

 154. 



26. Lecidea parasema, var. enteroleuca, Ach., Nyl. I. c. 217. 

 Etiam f. synothea, Ach. 



27. Lecidea albo-atra, var. athroa (Ach.), Nyl. I. c. 235. 



28. Arthonia tenellula, Nyl. in Flora 1864, p. 488. Vix 

 nisi var. A, patellulatce, Nyl. Scand. 262. 



29. Verrucaria sorediata, Borr. ( V. Garovaglii, var. incrus- 

 tans, Nyl. Prodr. Gall. 179, Pyrenoc. 20). 



30. Ve7Tucaria virens^ Nyl. Pyrenoc. 25, Scand. 270, var. 

 obfuscans. 



