108 THE VOYAGE OF H.M.S. CHALLENGER. 



Dendroceros adglutinatus, Tayl. 



Dendroceros adgluHmttts, Tayl. in Hook., Lond. Journ. Bot, 1845, p. 96 (Monoclea) ; Mitt, in 

 Melliss's St Hel., p. 372. 



St Helena.— Endemic. On trees, Diana's Peak— Hooker- ; Burchell. 



Anthoceros laevis, Linn. 



Anthoceros laevis, Linn. ; G. L. S., Synop. Hepat., p. 586 ; Mitt, in Melliss's St Hel., p. 373. 



St Helena. Melliss. 



Widely dispersed. 



LIOHENE S. 1 

 COLLEMACEI. 



Collemei. 

 Leptogium tremelloides, Fries. 



Leptogium tremelloides, Fries ; Nyl., Synop. Lich., i. p. 124 ; Leighton, Trans. Linn. Soc. Lond., xxvii. 

 p. 155, et in Melliss's St Hel., p. 373. 



St Helena. Burchell ; Melliss, 



Almost cosmopolitan, except in the colder regions. 



LICHENACEI. 



Cladoniei. 

 Cladonia pyxidata, Fries. 



Cladonia pyxidata, Fries; Nyl., Synop. Lich., i. p. 192 ; Leighton in Trans. Linn. Soc. Lond., xxvii. 

 p. 155, et in Melliss's St Hel., p. 373. 



St Helena. Burchell ; Melliss. 



Mr Leighton emirnerates three forms, namely, denticulata, decorticata, and chloro- 

 phcea, of which the two first are regarded by Nylander as distinct species. 

 Generally diffused both in the Northern and Southern Hemispheres. 



Cladonia aggregata, Eschw. 



Cladonia aggregata, Eschw. ; Nyl., Synop. Lich., i. p. 218 ; Leighton in Trans. Linn. Soc. Lond., 

 xxvii. p. 155, et in Melliss's St Hel., p. 373. 



St Helena. Burchell. 



1 The whole of these lichens were collected by Burchell and Melliss, and the enumeration was originally 

 published by the Rev. W . A. Leighton in the Transactions of the Linnean Society of London (xxvii. p. 155). 

 Concerning the collections Mr Leighton says : " Though not numerous, they are highly interesting and 

 instructive, as well from their insular locality itself, as more especially from their approximate similarity to the 

 Lichems Amazonici et Andini." 



