INTRODUCTION. iii 



iVfohr, who has so greatly reduced the number of spe- 

 cies made by other botanists, describe as distinct indi- 

 viduals many plants which we look upon only as varie- 

 ties. France boasts of Anictangium lapponicum, Grim- 

 mia plagiopodia, Trichostomtim pallidum, Timmia me- 

 gapolitana and austriaca, Neckera cladorhizans and 

 pennata, which we have not. Germany, also, of Amct* 

 aquaticum, Trich. pallidum, and the two species of Tim- 

 mia; of Cinclidium stygium, Dicranum ambiguum, cy- 

 lindricum, Schraderi, tortile, Didymodoii glaucescens 

 and latifolium, Grimmia trifaria, Splachnum urceola- 

 turn and Hypnum Halleri. Lapland has Splachnum ru- 

 bru?n, luteum and urceolatum, Didymodon latifolium and 

 pusillum, Dicr. cylindricum, Schraderi, Polytrichum. 

 capillare and Iffivigatum, Mnium turgidum, Cinclidium 

 stygium, Timmia austriaca, Bryum squarrosum, Hyp- 

 num sarmentosum, and Fonimalis falcata, which our 

 Flora is not possessed of* 



We have peculiar to our islands Andr&a nivalis, 

 {jrymnostomum Griffithianum^ viridissimum and Don- 

 nianum, Tortula agraria, Grimmia Daviesii, Weissia 

 Templetoni, Didymodonflexifotium, Orthotrichitm Hut- 

 chinsia, pulchellum and Lyelli, Daltonia splachnoides, 

 Bartramla arcuata, Plookeria l&te-virens, Zygodon 

 conoideum, and some others of less interest. 



In a work like the present it will not be expected that 

 we should enter much upon the subject of the structure 

 of the Mosses, or their modes of increase, and what 

 have been considered by most authors as the organs of 

 fructification. Indeed it is our opinion that too little 

 is at present known on these heads to enable us to speak 

 satisfactorily ; and we are hoping to gather much new 

 information, on the subject from our veiy intelligent 



b2 



