60 



LIST OF THE BRITISH 



1. Melobesia polymorpha. 



Q 



, UctlUdlt/cl. 



O. 



IdSLlLUlcitcl, 



4. 

 **• 



PCfP VIPlinTTTllCI 



dgctiiuiiuiiiiio. 



5. 



„ lichenoides. 



6. 



„ membranacea. 



7. 



„ farinosa. 



8. 



verrucata. 



9. 



„ pustulata. 



XLIX. HlLDEBRANDTIA. 



Frond cartilaginous (not stony), composed of very 

 slender, closely-packed, vertical filaments. 



1. Hildebrandtia rubra. 



L. Lithocystis. 



Plant calcareous, consisting of a single plane of cel- 

 lules, which are disposed in radiating, dichotomous 

 series, forming an appressed, nabelliform frond. 



1. Lithocystis Allmanni. 



