III. LICHENES VERRUCARIOIDEI. 



Ordo XIII. VERRUCARII. Thallus crustaceus. 

 Apothecium : excipulum proprium , sphaericum , vel ipsi 

 thallo vel verrucae thallodeae insidens , thalamium gelati- 

 nosum includens. Tab. nostr. 8. 



Genus XXV. SEGESTRIA. Fr. S. 0. V. 263. 

 Apothecium: excipulum duplex ; exterius e tuberculo thal- 

 lodeo formatum, interius proprium , ceraceo-membranaceum, 

 coloratum , apice papillula vel poro instructum, thalamium 

 gelatinosum servans. TAa/te tuberculosus. Tab. nost. 8. f. 1. 



1. Segestria umbonata (Pyrenula umbonata Ach. 

 univ. 316). Thallus mucoso-gelatinosus , subtartareus , 

 pallide cinereo-fuscus , contiguus , effusus. Apothecia 

 majuscula , rufo-fuscescentia seu cinnamomea , apice solum 

 e conicis thalli tuberculis prominula ; ostiolo papillato , 

 rarissime pertuso. Verrucaria umbonata Spic. 337. 

 Exs. 285. Tab. nostra 8. f. 1. Lich. thelostomus 

 Sm. EB. t, 2153. — Ad saxa quartzosa umbrosa vel aqua 

 suffusa in regionibus campestribus et alpin. Longob. Garovf 

 Helv. Schaer ; Gall. Lamy! Germ. Wall. Fw ! exs. 47. 

 Verruc. irrigua et erysiboda Mack, hib. II. 94. 98. 

 in coll. Salw ! anne et Verr. fissa Tayl. ibid. 95? sed 

 non vidi. 



^. elegans(ytvvvLC. elegansW^allr.crypt.germ. 1. 809); 

 apotheciorum ostiolo nigro-fusco. — In Thuring. Wallr., in 

 Siles. Fw! 



