184 THE BET. W. A. LETQHTON OK LICHENS 



others the spike has the usual form, and many of the flowers pro- 

 duce apparently perfect seeds, usually the relation between deve- 

 lopment of flowers and that of bracts is inverse. From the axil 

 of some of these enlarged bracts there grows a peduncle support- 

 ing a spike, which is nearer the natural structure as to length, 

 size of bracts, and development of flowers. 



TfilFOLirM HTBEinUM. 



This plant, known as a forage plant by the name Alsike Clover, 

 sometimes shows complete transformation of its ovary into a leaf 

 resembling in miniature the ordinary leaves of the plant. Some- 

 times the change is incomplete, the leaf remaining conduplicate, 

 with edges partially adherent near the apex, with a gradual pro- 

 longation resembling style and stigma. 



America. Bv the Eev. W 



i^ EiCHAEDSON in Arctic 

 ^nv "RAT? R S E. Com- 



municated by Dr. Hooii:EK, T.E.S., V.P.L.S. 



[Eead March 16, 1865.] 



[Plate II.] 



At the request of Dr. Joseph D. Hooker, of Kew, I have under- 

 taken to examine and name a large case of Lichens collected by 

 Sir J. Richardson in Arctic America, chiefly in 1826, and the fol- 

 lowing descriptive Catalogue is the result of the examination. 



The localities whence the Lichens were collected were Mac- 

 kenzie Eiver (lat, 67^ N.) ; Great Bear Lake (lat. 66° N.) ; Tort 

 Franklin (lat. 65° 14' N.) ; Fort Enterprise (lat. 64° 33' N.) ; 

 Great Slave Lake (lat. 61° 80' N.) ; York Factory, Hudson's 

 Bay (lat. 57° N.) ; Missinnippi Eiver (lat. 55° 40' N.) ; and Eiver 

 St. Mary's, Lake Superior (lat. 47° N.). 



The numher of Lichens which I have named is 163, includiug 

 species, varieties, and forms. ^Only two Lichens, JPlatt/sma Eichard- 

 sonii and Dactylina arctica peculiar to North America were found 

 in the collection ; unless the species which I have hereafter de- 

 scribed as new, Verrucaria Frankliniana^ Arthonia intumescens^ 

 and Odontotrema Richardsonii are to be added, but whose distri- 

 bution is at present necessarily doubtful. The remainder wer© 

 common to Scandinavia and Europe generally. 



* 



