] LIST OF THE PLANTS. 



59 



no tat a. Precedent i 



Tfiallus lacero-laciniatus, supra densissime purpureo-rugosus, subtus magis aut minus reticulato-lacuno- 

 sus, glaber. Apothecia difformia, angulata, convexa, plicis utplurimum circinatis 

 affinis et fortasse varietas senilis. (B.) 



Expl. Iconis eadem ut in prsecedenti. 



553. G. pensylvanica : Ach. Syn.p.67. Muhl. Cat. p 105. Tab. 30. Fig. 2. 



Thallus tenuis umbilicatus, irregulariter expansus flexuosus, passim erosus, in ambitu tacero-laciniatus, 

 supra umbrino-brunneus, plerumque prope umbilicum materia qu&dam Crustacea canescens, papulis elevatis, 

 oblongis vel conoideis, obtusis, sparsis, discretis, saccis paginae adversse respondentibus munitus ; subtus 

 lacunosus, punctis crebris elevatis scaber ; brunnescenti-niger ambitum versus pallidior ; utrinquc opacus 

 Madefactus aliquantulum pallet et supra olivaceus vel aeneo-fuscus evadit. 



Apothecia simplicia adpressa, orbiculata vel flexuosa angulataque, disco opaco, piano vel concaviusculo, 

 aequabili interdum ostiolo centrali impresso et margine proprio elevato nitidiusculo cincto. Apothecia ali- 

 quando in discis suis alia minora ferunt vel cum aliis confluunt quibus modis formatur apothecium satis 

 magnum disco planiusculo irregulariter plicato margine communi flexuoso, et angulato cincto. Sunt 

 quoque in thallis quibusdam fortassin vetustioribus apothecia dissimilia parva, discreta, aut conferta, discis 

 depressis et marginibus granulato-crenulatis, rugosis, inflexisque. Apothecia vetustiora utriusque generis 

 in ambitu k thallo elevata sunt. 



Thallus interdum locos humidos opacos habitans flavescenti-cinereus fit. (B.) 



Expl. Icon : a. superficies thalli supina, b. superf. prona mag. nat. c. apothecium et portio thalli exsecti 



sub lente visi. 



M 



Muhl 



Thallus hujus quam trium praecedentium paulo crassius, plerumque polyphyllus, hepatico-brunneus, 



nigncans 



catus, plerumque irregulariter expansus, margineque lacero, hie illic pertusus erosusque ; supra glaber, niti- 

 diusculus, foveolis ab apotheceis impletis ambitum versus praecipue impressis ; subtus sordid^ flavescenti- 



cribriform 



I vix 



unquam 



semper in sacculis immersa sed etiara in plan& superficie thalli sessilia. Dantur quoque in eodem thallo 

 apothecia alia parva fere orbicularia, disco depresso et margine granulato rugosoque inflexo. 



pars 



thecio exsecta, et sub lente visa. 



Hab. This and the three preceding species were found in greater or less abundance in all rocky placet 



throughout our journey. We 



ijiii 



but 



party 



plaints. The Indians use the G. Muhlenbergii, rejecting the others, and when boiled along with tish-roe or 

 other animal matter, it is agreeable and nutritious. On the Barren Grounds this lichen is scarce, and we 

 were obliged to resort to the other three, which served the purpose of allaying the appetite, but were very 

 inefficient in recruiting our strength. 



. G. vellea, Ach. Syn. p. 68. Umbilicaria vellea. Mich. FL Am. ii. p. 323. 



pedalis, sordide flavescenti-gnseu 



ambitu sub rotundato 



bus, furcatis, nigris, hirsutus* Apothecia nunquam 



woods. This is more agreeable to eat than any id 



the preceding species, but we met with it very sparingly on the Barren Grounds. 



556. Opegrapha macularis: Ach. Syn. p. 72. Muhl. Cat. p. 105. (W 



