( 270 ) 



317; CoU. fasciadareFr. L. S. exs. 50, Mont. Chil. viii, p. 219, 

 Coll. Ihysaneum Moug. St. Vog. 453, DR. Alger, p. 208. Thallo 

 firniiore, minus dilatalo , nee radialini riigalo , diffort a praice- 

 dente. — Ad truncos arboruni et niuscos in Gallia passim 



22. C conglonierattini Iloffm. Fl. Germ. p. 102, Nyl. Alger, p. 319, 

 Zw. Exs. 167, Nyl. L. P. 102 ; Coll. fasciculare var. conglome- 

 ratum Ach. L. U. p. 640, Syn. p. 317. Lamina tenuis thalli iodo 

 soluto immersa , desiccata sanguineo-rubens; qui color ruber 

 aqua addita mox evanescit. — Ad truncos arborum , pr^sertim 

 populorum ulmorumque prope urbes, in Gallia baud rarum (1). 



IV. LEPTOGIUM Fr., emend, defin. 

 A. — Thallus crusloeformis , lobulato-aggrcgalus vcl granulosus. Sp. i. 



1. ly. byj^sinum Zw. Exs. 174; Collema byssinnm Hoffm. Fl. G. 



p. 105. Thallus cinerascens tenuiter corallinoideo-granulosus, 

 elTusus, valde friabilis, apothecia biatorina pallida vel obscure 

 rufa; sporse 8"* ovoidefe, longit. 0,020-27 millim., crassit. 0,008- 

 0,012 millim. — Ad terram in Gallia occidenlali, ad Yire, opti- 

 mum legit D. Pelvet. 



B. — Thallus membranaceus, lobalus, varie disseclus , vel crenalo-divisus. Sp. 2-ii. 



2. It. cretaeeuni. Lichen cretaceus Sm. E. Bol. t. 738; Collema 



Ach. L. U. p. 642, Syn. p. 318. Thallus fuscus microphyllinus 

 rosulalo-lobalus, lobis inaiqualiter crenatis, crassiusculus ratione 

 minutiei, granulatus , apothecia biatorina sparsa; sporaj 

 ovoidesc, varie divisa;, longit. 0,0022-40 millim., crassit. 0,011- 

 17 millim. — Ad lapillos calcareos prope Parisios, S'-Cloud. 



3. li. subtile Nyl. in Obs. ad Hepp Fl. Eur. 211 , L. P. 2 , Lichen sub- 



tilis Sm. E. Bot. t. 1008; Collema subtile Ach. L. U. p. 659, 



(1) In Gallia meridionali verisiniiliter adest Collema phylliscinum Nyl. in hb. Le- 

 norni., ciijus thallus olivaceo-nigricans diminutus peltatus vel varie lobatus, ambitu 

 obsolete crcnalus, satis flrmus, apothecia obscure fusco-rufa plana, marginc thallino 

 depresso cincta ; sporaj 8°» ellipsoidea; vel fusiformi-oblongK , uniscptata;, longit. 

 0,013-21 millim , crassit. 0,007 millim., paraphyses arliculatse. Gelalina hymenea 

 iodo cojrulescens. — Ad saxa calcarea prope lacum Larium ledum a D"" Garovaglio, 

 ex hb. Lenormand. 



