Thai . 



LICHEN VLES. 





A i 'in ••>>< 'I 

 / 





M 'I'll me, in the beautiful □ 

 universally in lichens of conci 



uute bodies aua ' 



Thallogens, bu< motionless, and tl 

 The following is a brief al 











o *> 







§^: 



S 





i 



\ 



Pig. XXXIII.** 



The icles of lichens are those minute dark specks, b are 



nunilior to the students of Buch plants, and which Hedwig long ago suj 

 male organs. In Pannelia tiliacea they are particularly 

 of black points scattered, or more frequenl 

 thallus; their section pn dark greyish very hygi 



cavity is simple, opening by an imper 

 They ar< lined by an infinite multitude of Uttle 



rds thi : of the organ, and prod ch at it 



sp. rmatia, The latl 



a'llin in_', to the cell that l'"r>' them wire found to I"- from 





■ 



millimetre in length ; it is probable, howe> 

 for when I rmatia are scarcely more than froi 



re long. When the spern full grown, and I 



ird that it may ho picked out of the th alius with tl 

 ah snothii I id with producing shields, ae M. I' 

 The last named obsi res the follov lount of i 



the fructification of Lichens. H bes them as either hen 



or dioecious. In the tw> former cases there is a prothallua and thai! 

 in hypothallufl. The prothallua is the Brat 

 ri rn : n ition of perf< ci oi imperfect Bpon 3. I 

 female stratum. In dioecious Lichens, such 1 I 

 ■ntherids, with imperfect Bpores (audi 

 resembling apothecia, When, however, both b> 

 thallns arises, which consists of t\\.> principal strata : tl 

 tln> radical stratum and the filament above it. the 



produce the male gonidia ; and the female 

 the female gonidia, and the cortical All these are pn 

 Lichens. The gonimio stratum is never ab 

 be deficient In the hermaphrodite Lichens, th. 

 the female, and greenish yellow ; wl 







Pig.XXXIII." Perpendicular section 



Its Bpermati 1 ; 2. the colls which generate the - 



iiiach;>- 



