CRYFTOGAMIA. LICHENES. 85 



478. Ulva. 



1 latissima. On the shores of Long-Island. 



2 purpurea. With the former. 



3 mtestinalis. In ditches. 



4 lactuca. In salt water. 



5 lubrica. In ditches. 



479. Nostoc. 



pruniforme. Agardh. Synop. Alg. Scand. p. 134. 

 In fresh water ponds. New- Jersey. Oct. Cumberland, 



LICHENES, according to Acharius 



480. Arthonia. 



punctiformis. On the branches of trees. 



481. Lecidea. 



1 iinmersa. On rocks. 



2 incana. Syn. Meth. Lich. 

 Lepraria incana. Lich. Uniev. 



On the bark of old trees. 



3 muscorum. In woods on moist ground. 



4 sabulaetorum, B. geochroa. Meth. Lich. 

 muscorum, B. geochroa. Lich. Uniev. 



On the steatitic hills, Staten-Island. 



5 icmadophylla. On the trunks of trees. 



6 alba. On the trunks of trees. 



482. Gyrophora. 



1 papulosa. 



Umbilicaria pustulata. Mx. 

 On rocks. Fort Washington. 



2 vellea. 

 Umbilicaria vellea. Mx. 



On rocks. 



483. Calicium. 



1 turbinatum. On the stumps of decaying oak trees. 



2 stigonellum. With the preceding. 



484. Graphis. 



1 scripta. On the smooth bark of trees. Betula, &c 



485. Verrucaria. 



stigmatella. On the trunks of trees. 



486. Endocarpon. 



miniatum. On wet rocks. Patterson falls. 



487. Porina. 



pertussa. On the trunks of trees. 



488. Variolaria. 



1 communis. On the bark of trees and on rocks. 



2 amara. In similar situations. 

 489- Lecanora. 



1 parella. On rocks. 



2 subfusca. On the trunks of trees. 

 490. Evernia. 



prnnastri. On the trunks of trees. 



