VIIl] 



DETERMINATION OF LIVERWORTS. 



231 



body. Such genera as Pellia, Marchantia, Lunularia, Reboulia, 

 and others bear a striking resemblance to Fucus, Chondrus and 

 many other algae. 



Imperf'ecb specimens of certain Lichens, not to mention 

 some of the Polyzoa, might easily be mistaken for Liverworts. 

 Among the higher plants, there are some forms of the Podo- 

 stemaceae which simulate in habit both thalloid and foliose ' 

 Liverworts as well as Mosses ^ The members of this Dicoty- 

 ledonous family are described as water-plants with a Moss- or 

 Liverwort-like form ; they occur on rocks in quickly-flowing 

 water in the tropics. In one instance a recent Podostemaceous 

 genus has been described as a member of the Anthocerotales ; 

 the genus Blandowia', referred to by Willdenow as a Liverwort, 

 has since been recognised as one of the Podostemaceae. The 

 resemblance between some of the foliose Hepaticae and genera 

 of Mosses is often very close. In certain Mosses, such as 

 Hookeria pennata', the large two-ranked leaves suggest the 

 branches of a Selaginella. 



Fia. 48. A. Tnstichia hypnoides Spreng. From a specimen in the British 

 Museum. B. Podocarpus cupressina Br. and Ben. (After Brown and 

 Bennett*.) C. Selaginella Oregana Eat. From a plant in the Cambridge 

 Botanic Garden. A, B and C very slightly reduced. 



1 Hooker, J. D. (91) p. 513. 

 3 Hooker, "W. J. (20) PI. clxiii. 



2 Sohiffner (95) p. 140. 



* Bennett and Brown (38), PI. v. 



