and particularly of the Genus Mnium. 263 
Arrhenopterum heterostichum. Hedw. Sp. Muse. 198. t. 46. 
/• 1-9. 
Bryum heteropterum pellucid urn. Bill. Muse. 552. t. 45./. 11. 
minus bene. Herb. Dill. 
B. foliis membranaeeis obtusis. Dili Muse. 552. t. 35. f. 19. 
melius. Herb. DHL 
B. caule erecto ramoso, foliis ovatis undique imbricatis. Linn. 
FL Lapp. ed. 1. 317. Herb. Linn. 
Hypnum illecebrum. 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 illecebrum. 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 how little importance that circumstance is in 
nature ; for every thing clearly evinces the affinity of this moss to 
; the original Mnium. The Hypnum 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- 
