and particularly of the Genus Mnium. 2(5.3 



Arrhenopterum hetcrostichum. Hedw. Sp. Muse. 198. t. 46. 



/• 1-9. 

 Bryum heteropterum pellucidum. Dill. Muse. 352. t. 45./. 11. 



minus bene. Herb. Dill. 

 B. foliis membranaceis obtusis. Dill. Muse. 552. t. 35. f. 19. 



melius. Herb. Dill. 

 B. caule crecto ramoso, foliis ovatis undique imbricatis. Linn. 



Fl. Lapp. ed. 1. 317. Herb. Linn. 

 Hypnum illeccbrum. Linn. Fl. Lapp. ed. 2. 329. Sp. PL 1594, 



excluso syn. Dill. 

 Habitat in Virginia, Pensylvania, ctiam Lapponia. ' 



I am obliged to Mr. Dawson Turner for the very interesting 

 discovery of this being the same with the Lapland plant which 

 Linnaeus called Hypnum illccebruni. I had often examined the 

 original specimen, without any success ; for, though it evidently 

 appeared to be nothing known in Europe, I had not then seen 

 the Arrhenopterum. I retain this generic name as an adjective for 

 the specific denomination. Its only pretensions to be a genus 

 consisted in the male flowers being axillary : and it furnishes an 

 additional proof of bow little importance that circumstance is in 

 nature ; for every thing clearly evinces the affinity of this moss to 

 the original Mnium. The Hi/pnum n. 46. of Dillenius may there- 

 fore now retain the name of illecebrum, which was adopted from 

 his definition of it in his work. 



XVI. Ob- 



