Calicium.] LICHENES. 139 



3. C. tigilldre, Pers. (yellow sessile Rail Calicium); crust 

 granulated tartareous bright greenish-yellow with large warts 

 scattered over the surface, pilidia somewhat immersed in the 

 warts (sessile) plano-convex black with an elevated tumid 

 border, sporules black. Turn, and Borr. Licit. Br. p. 133. Acli. 

 Syn. p. 55. — Lie/ten tigillaris, Ach. Meth. p. 46. t. 2. f. 1. 



Old pales and rails, rarely on trees, in Essex and Suffolk. — This ex- 

 tremely beautiful Calicium is distinguished by its bright-coloured wide- 

 spreading crust, with black, apparently entirely sessile, apothecia Mink in 

 the crust; so that the plant looks, at first sight, like a Lecidea: but the 

 apothecia are those of a Calicium, and Acharius says that they are some- 

 times borne on a very short stipes. 



4. C. tympanellum, Aeh. ( soot y -fruited Calicium); crust 

 granulated tartareous greyish-white, pilidia turbinate (sessile) 

 partly immersed black with a thin erect whitish border, sporules 

 pruinose. Ach. Syn, p. 56. Turn, and Borr. Lick. Br. p. 134. 

 — Lichen inquinans, E. Bot. t. 810. 



On old pales, and especially on the tops of posts, not uncommon: 

 sometimes on the bark of trees. — This, from its almost entirely sessile 

 and immersed pilidia, differs remarkably from the really stipitate Calicin. 

 Its fructifications are, however, large, and the plant may be easily 

 recognized by the readiness with which the profuse sporules detach 

 themselves on being touched; so that on the application of the finger, 

 an impression is received of as many apothecia as have been covered by 

 it. The favourite situation of this plant is the tops of old posts, growing 

 upon them, and therefore, transversely with the grain of the wood. 



5. C. femtgineum, Turn, and Borr. (rusty Calicium); crust 

 granulated tartareous whitish with scattered rust-coloured 

 spots, pilidia stipitate and sessile, rapitulum turbinate, sporules 

 rust-coloured covering the border. Turn, and Borr, Lick. Br. 

 p. 136. B, Bot. t. 2473. 



Old pales, Norfolk and Suffolk. — Crust of Several inches in extent, 

 composed of looserj cohering greyish granules, of a greyish-white, 

 marked with yellowish rust-coloured spots, which render the plant COO* 

 Bpicuous. Pilidia sometimes confluent, sometimes partiallj immersed in 

 tlie crust. Stipes very short and thick. 



** Apothecia stipitate. 



i). 0. elan ///////, Turn, and Borr, (arey-crusted Calicium); 

 crust granulated tartareous whitish, pilidia stipitate. capitulum 

 turbinate csesious beneath with a thin elevated ccesious border, 

 sporules black. Turn, and Borr* [Ach Br,p.l8&, — ( '.< Iae,cnlarc, 

 Ach. Syn. p. 67. — Lichen ckwdlut, II. Bot t. L465. 



Frequent on boarded buildings, in England. Auchindeny, Scotland, 

 J)i. Greville, — Crtut greyish-white, in wide but interrupted 



lies. Stipes straight, moderately long. Apothccium covered at first 

 with a grej pellicle* 



7. ('. hyp dhiu. Ach. (bright-y lUno Calicium); crust granu- 

 lated somewhat tartareous, pilidia stipitate, capitulum nearlj 

 hemispherical brownish-black, sporules fuliginous ■ the 



