ISTDIUM. 



S p e c i e s. 



1. Isidium dattylinum: crusta effusa rugoso-verru- 



cosa subrimosa papilloso-ramosa alba, papillis 

 elongatis cylindricis reiiis aggregatis soiidis, a- 

 pice demum fuscis rimoso-rumpentibus; stra- 

 to proligero denudato convexiusculo. 

 Llchen daclylinus Lich. Pr. p. 89« 

 Icon. Tab. nostra 3. f. 6. 

 Habitat in alpibus Lapponicis ad terram mu- 

 scisque instratum. SWARTZ. 



Obs. Lichen singularis. (Cfr. Descriptio in Expli- 

 catione Iconis.) Stratum proligerum in perfe&is spe- 

 ciminibus quasi nucleum efformat, haud secus ac 

 |n Sphaeropboris , sed solidum 8C numquam, quate- 

 nus ego observare potui, in pulverern solvendurn 

 vel fatiscentem nec elabentem. 



2. Isidium gonatodes: crusta tenuissima ramulosa 



albo-glaucescente, ramis divaricatis tortuosis 

 lobato - verrucosis ramulosisque solidis diffor- 

 jnibus apice obtusis rotundato-subglobosis albo- 

 pallescentibus. 



Lichen gonatodes Lich. Pr. p. 89- Stereo- 



caulon madreporiforme? HoFFM. Fl. Germ. 

 p.jQg. 



Habitat in montibus Lappou. inferioris mu- 

 scos incrustans. 



Obs. Ambiguum vegetabile. Crusta ipsa muscis 

 instrata tenerrima glaucescens. Ex ea prodeunt ra- 

 mi glabri confertissimi irregulares flexuosi verruco- 

 si cagspitulum formantes. Foite ex ramulis 8C fb- 

 liis muscorum 8Cc incrustatis , originem ducunt i- 

 psi rami. Apothecia nulla vidi, sed stratum proli- 

 gerum, in apicibus ramulorum subglobosis occul- 

 tum, 8C in speciminibus visis nondum perfe&e 6- 

 volutum 1. denudatum adesse suspicor. 



Meth. LlCH. N 



3. Isi- 



