Parts of Fructification in Mosses. S$J3 



and it may perhaps in some degree tend to strengthen the 

 character of Leptostomutn, to advert to what appears to 

 be really the case in certain species of Pterogonium, in 

 one of which* Mr. Hooker has already described the fringe 

 as derived solely from the inner membrane ; and I have 

 collected, on the mountains of Van Diemen's Island, a 

 moss with a peristomium decidedly of like origin; a cir- 

 cumstance that appeared to me so remarkable, that I had 

 actually described it as a distinct genus, before I was aware 

 of the similar structure of the Nepal plant described by 

 Mr. Hooker; or of the probability, from Hed wig's own 

 figures, that some at least of his Pterogoiiia were 'of the 

 same structure ; a point that I have not at present the means 

 of determining, but which I beg leave to recommend to the 

 attention of those botanists who are provided with perfect 

 specimens of the published Pterogonia. 



EXPLICATIO TABULAE XXIH. 



Fig. 1. Dawsonia polytrichoides. a. Mascula planla magnitu- 

 dine naturali. h. Discus masc. auctus. c. Ejusdem flos 

 unicus. d. Idem absque folio perigoniali, magisque auctus. 

 e. Anthera et filumsucculentum maxime aucta. /. Femincoe 

 plantar magn. nat. g. Vaginula cum foliis pericha^tialibus 

 auctis. h. Capsula cum calyptra exteriori. i. Pili calyptrje 

 exterioris magis aucti. j. Capsula cum operculo etcalyptrd 

 interiori. k. I. Capsula deoperculata cum peristomio. m. Cap- 

 sular sectio ejusdem figuram insertionemque ciliarum os- 

 tendens. o. Calyptra interior, p. Operculum cum colu- 



• Pterogonium declinatiini. Trans. Linn, Soc, ix. p. 309. 



mellar 



