57 



XXXI. VERRUCARIA, Pers. Stroma thallodes nullum. Perithecia 

 solitaria prominula, carbonacea (aterrima), ostiolo simplici. 



1. rupcstris, Schrad. 



2. umbrina, Ach. Wahl. 



3. pullftj Ach. 



4. nitida, (Weig.) Schrad. 



5. alba, Schrad. 



6. gemmata, Ach. 



7. epidermidis, Ach. Fr. 

 . analepta, (Fr.) 



ft. cerasi, (Fr.) 

 y. diminuta, (Fr.) 



8. punciiformis, Pers. (V. cinerea, Pers., stigmatella, Ach.) 

 Trib. IV. LIMBORIACE./E, Fr. Excipulum proprium carbonace- 



um clausum (perithecium) dein varie et irregulariter dehiscens. 

 Thallus crustaceus. 



XXXII. PYRENOTHEA, Fr. Perithecia carbonacea, clausa, ostiolo 

 pertusa, nucleum subgelatinoso-fatiscentera protrudentia, dein 

 dehiscentia. 



1. leucocephala, (Ehrh.) Fr. (Lecidea abietina, Ach.) 



XXXIII. CLIOSTOMBM, Fr. Perithecia carbonacea, clausa collapsa 

 rtigoso-plicata, rugis dernum dehiscentibus. 



XXXIV. LIMBORIA, Eschw. Perithecia carbonacea, clausa, de- 

 mum e centre versus ambitum in lacinias stellatim dehiscentia. 



XXXV. STRIGULA, Fr. Perithecia carbonacea, clausa, disco col- 

 labentia. Subepiphylla. 



With the genus Strigula, so exactly on the confines of Lichenes 

 and Fungi, that it is included in the system of each class, we reach 

 the most imperfect lichenose vegetation to which we can descend. 

 There remains one other of the three orders of Algae to be illus- 

 trated here, the Byssacese, which are the intermediate and am- 

 phibial tribes between aerial Algse or Lichenes, and aquatic Alg, 

 or Phycees. Their position in the System has already been indi- 

 cated, in the first part of this treatise. Before taking them up, 

 however, I wish to present Fries's disposition of the genera of Li- 

 chenes, according, simply, to affinity and analogy, as thus arranged 

 by him in parallel series. 



