493 
55. Gyrophora murina (Ach.) DC. Nyl, Prodr. Lich. Seand, 
p. 116; Umbilicaria grisea Hoffm. Deutschl. Flor. p. 111. 
Ad rupes, et saxa, Sierra Tucreman, apud Cienegam. 
speeimina pulchra! 
56, Pyxine sorediala (Tuckerm.) Fr, 
Ad cortices, 
57. Pysxine Meissneri Tuckerm, Proceed. of the Am. Acad, 
of. sc. and arts. 1860, p. 400; Nyl. Lich. exot. p. 255, 
Ad cortices. 
Sporae long. 0,015—019, crass. 0,006 mm., olivaceae, 
(In Pysine Cocoes (Sw.) sporae long. 0,012—018, crass, 0,004— 
005 mm.) 
Thallus in Pysine Meissneri intus non constanter sul- 
phureus, sed interdum etiam albus, sicut in P. cocoös (Sw.). 
Conira thallus in Pyxine Cocoös interdum etiam intus sulphureus 
vel lutescens, quamvis raro, itaque differentia essentialis inter 
has ambas species praesertim in sporis quaerenda sit, 
58. Placodium callopismum (Ach. Syn. p. 184 sub Lecanora) 
Nyl. 
Ad rupes calcareas, raro. 
59. Lecanora auranliaca (Lightf.) Nyl. 
f. fiavovirescens Hoffin. et diffraetum Mass, 
Ad rupes, frequens. — (fragmentum!) 
60. Lecanora millegrana Tayl. in Hook. Journ. Bot. 1847, p, 
159, Nyl. Prodr. Lich. Nov. Gran. 2. p. 64, sub Lecidea, 
Ad cortices, optime evoluta. 
61. Lecanora fusco-nigrescons (Nyl.) Krphb.; Lecanora mille- 
grana f. Jusconigrescens Ny]. in Prodr. Lich. Nov. Gran. 2. p. 64. 
Thallus einerascens, erustaceus, continuus, tenuiter ru- 
gulosus, effusus (saepe leviter a substrato se resolvens); apo- 
theeia sessilia, numerosa, juvenilia minute, disco planiusculo 
pallido-rosaceo-fusee, pallido-marginata, adulta mediocria (diam, 
0,6—0,7 mm.), disco atrofusco, fusconigreseente vel nigro, plus 
minus convexo, nitido aut opaco, a& margine proprio fusce- 
scente, sat tenuiintegro, saepe plane evanido, cincte, intus alba. 
Sporae 8nae, aciculares, rectae vel nonnihil flexae, septatae, 
long. 0,055—066, crass. 0,002--003 mm. Paraphyses conspicuse, 
dense aggregatae, immo conglutinatae. Hypothecium album, 
Ad ramos ramulosque arborum, 
Lichen, meo sensu, propriam speciem .sistens, non 
