Mr. R. Spruce on the Musci and Hepaticce of the Pyrenees. 273 



marginibus inflexis semi-amplexicaulia ; *' aliorum ramorum erec- 

 tiuscula, aliorum secunda" (Schwgr.), laxe et subquadrifarie imbri- 

 cata, alia recta, alia oblique incurva, ovata, ovato-lanceolata et 

 ovato-acuminata, quoad apicem nunc acuta nunc obtusa, margine 

 plana; omnia denticulata, nervo perbrevi quartara folii partem ut 

 plurimum emetiente, nunquam ad medium usque producto, nunc lato 

 et obscuro, nunc ramoso vel e basi ipsa bifurcate, instructa ; cellulis 

 mediocribus, oblongis, prominulis areolata et dorso valde papillosa ; 

 in csespitibus sterilibus saepe pallida, flavescentia, in fertilibus autem 

 fere semper saturate yiridia. Florescentia dioica. Caules masculi cum 

 foemineis immixti, iis tenuiores : flares numerosi, alares, ovati, foliis 

 12 plus minus, ovatis, exterioribus obtusis, internis acuminatis, acu- 

 mine torquato, enerviis, valde concavis, obscure denticulatis, areo- 

 latione laxiori ; antheridiis baud copiosis, paraphysatis. Foeminei floris 

 folia perichsetialia sat numerosa, externa brevissima, interna elon- 

 gata et flexuoso-acuminata, enervia, subdenticulata, laxe areolata, 

 baud papillosa. Vaginula teres, viridis, apice tamen atro-rubens, 

 archegoniis et paraphysibus numerosis perichaetium baud sequantibus 

 onusta. Pedicellus semuncialis, Isevis, rufus. Capsula ovato-oblonga, 

 cernua, e brunneo olivacea. Peristoma externi dentes 16, trabe- 

 culati, linea media exarati, pallidi: interni membrana carinato-sul- 

 cata, in processus totidem solidos, ciliis binis filiformibus interjectis, 

 ultra medium fissa. Annulus duplex, revolubilis. Operculum e basi 

 conica rostratum, rostro oblique curvato, capsulam fere aequans. 

 Calyptra dimidiata, glabra. Semina congenerum. 



Ab hoc differt/jT. dimorphum, Brid., foliis caulis divisionumque pri- 

 mariarum squarrosis ; ramis dense foliosis, foliis arete appressis " unde 

 ramulorum facies teres " (Brid.), latioribus, obtusioribus, nervis binis 

 tenuioribus et plerumque longioribus, e cellulis brevioribus areolatis, 

 et maxime operculo conico. 



Obs. I have been thus particular in my description of this disputed 

 moss in the hope of finally settling its name and synonymy. The 

 characteristic figure of Schwaegrichen, though representing a barren 

 specimen, and his description, accurate as far as it goes, place it be- 

 yond a doubt that his Pterogonium heteropterum is the same plant as 

 the Hypnum catenulatum of English authors ; but that it cannot be 

 identical with the H. catenulatum of Schwgr. will be obvious from the 

 following considerations. The leaves differ from Schwgr. 's descrip- 

 tion of H, catenulatum in being oblique, decurrent at the base and 

 slightly embracing the stem, the margins plane (by no means " stria 

 utrinque marginali brevi," which implies a decidedly reflexed or re- 

 curved margin), papillose and truly denticulate^ , the nerve very short, 

 not " ultra medium evanescente." Besides these discrepancies are 

 the very important ones of a dioicous inflorescence and a decidedly 

 rostrate lidf, not " conicum brevissimo rostello." 



* The authors of * Muse. Brit,' for want of examining with sufficient mi- 

 nuteness, supposed that the denticulation of the margins was ovXy apparent, 

 arising from the papillosity of the surface. 



t Represented shorter in the ' Muse. Brit.' figure than in my Pyrenaean 

 specimens, and in original ones from the authors. 



Ann. ^ Mag. N, Hist. Ser. 3. Vol. iii. 18 



