446 HEPATIC^. 



In the "Journal of Botany," July 1900, lio published it as 

 new to Britain, and gives some interesting notes how to dis- 

 tinguisli it from the two other species of the genus, from which I 

 take the following : 



" The fronds bear considerable resemblance to those of 

 P. calycina, the species being un distinguishable with certainty 

 when barren. The younger fronds are reddish-brown to dai k 

 green, frequently wavy at the edges ; the older ones are dark 

 brown, narrower, and flat. It also resembles calycina in bein^- 

 dioicous, but the male plant is without the hammer-shaped furcate 

 innovations of the latter. The most distinctive character between 

 the two species lies in the structure of the interior layer of the 

 capsule wall, caJyciyia being entirely without rings, while the 

 present plant agrees with epijjliyJJa in being furnished with them. 

 The involucre forms a complete ring, as in calycina, the cylinder 

 varying in length, but never so long as is frequently seen in the 

 latter. The calyptra is more or less exserted, sometimes only 

 slightly beyond the involucre, but more commonly for some 

 distance, and frequently as much as in e/jiphylla. It is usually 

 included in calycina. 



" Pellia epijiliyUa differs in being monoicous, the antheridia 

 being on the same frond as the female, and it has commonly much 

 broader fronds, which are generally green. Tlie darker coloured 

 narrower forms cannot be distinguished with certainty in the 

 barren state from Neesiana. Besides the difference in the 

 inflorescence. P. ejiiphylla also differs from the two other species 

 in that its involucre does not form a complete ring, the antical 

 portion being absent; and the mouth of the involucre looks 

 towards the apex of the frond, while in the others it is vertical. 

 The calyptra is always highly exserted. The interior layer of the 

 capsule wall has more numerous rings than in Ncesianay 



