MUSCI PRiETERITI. 355 



of Stereodon cupressiformis ; deep red pedicels ; shortish capsules, 

 very much arched and cernuous, short-necked, of a fine orange- 

 brown on the upper, yellow or green on the under, side, and quite 

 smooth in every stage; lid conical, subobtuse, never rostellate. 

 They agree exactly, except in colour, with specimens in Schimper's 

 ' Stirpes Normales,' with others from Bruch, and with specimens 

 gathered by myself in Teesdale in 1843. As this, considered the 

 typical form of PL denticulatum on the Continent, differs consider- 

 ably from the ordinary English form, I add a description of it. 



Plagiothecium denticulatum, L., subsp. aptychus, Spruce. — 

 Monoicum humile depresso-caespitosum viridissinium vel argenteo- 

 viride, recens et siccum nitidum, vage ramosum. Folia ple- 

 rumque decurvo-subsecunda, ovato-lanceolata breviter apiculata 

 acuminulatave, costis breviusculis, margine infero vix reflexo; 

 cellulae perangustae (f^x^min.), basales paucse laxiores, alares 

 rectangulares utrinque 2 vel 4. Bractero ? foliis longiores et 

 angustiores, magis acuminata;, ssepe enerves. Pedicellus ruber, 

 inferne dextrorsum, supra medium sinistrorsum tortus. Capsula 

 breviuscula, oblongo-cylindrica, collo vix ullo, iuclinata vel 

 horizontalis subcernua, sicca arcuato-cernua saqieque subpendula 

 sub ore constricta, bicolor, facie superiore aurantiaco-badia, mfenore 

 flava vel virescens. Operculum breve, conicum, raro subapiculatum, 

 obtusiusculum. Annulus variabilis, duplex triplexve. Penstommm 

 pallidum sublaave ; dentes ext. subulati acummati arete trabecular ; 

 internum ad i fissum, processus integri vel pertusi, ciliola bina 



capillaeea. . •• '"'. 



The second, or Wilsonian form, differs from the foregoing 



mainly in the fruit, and may be thus briefly defined : 



Plagiothecium denticulatum, L., subsp. sulcatum, Spruce. 

 Folia planiora saspeque laxiora, rarius subsecunda, sicca interdum 

 crispula. Bracteae persaqie longe unmerves. Capsula long- 

 pedicellata plerumque palhda-albido-vmdis, sup™matura fla - 

 vescens vel palhde badia, raro rubescens-cylmdi'ica aequahs 

 vel parum cernua, raro distincte cernua, sicca suberecta vel 

 inclinata interdum subincurva, vacua semper fere dis metes tmto, 

 collo longiusculo. Operculum conico-acummatum vel ;™^un- 

 Peristomium PI a^chi. Floreseentia, f^J^^eSes 

 dente subspecie, normaliter antoica ; plant* tamen unisexuales, 

 cum aliis bisexualibus mixtae, interdum adyeniunt 



This is bv far the commoner form with us, but the two forms 

 are ometimls found intermixed, each ^y^^hES^ 

 characters-no proof either for or ^^^J^ c ^ ^ 

 for two varieties of a species (of various orde r of . p ants) aie often 

 seen to grow side by side for years, without an> ^™J^™ 

 n king its appearance; such connecting *™^3^5?% 

 on other sites" as in the present instance I 1 ve gatbeied m the 

 Pvrences (at Gc'los, n. r Pan ; also near Luz, and in tne Vailee cm 

 Lvs mettv 1 rf form of PL dentiruhdun,, having most of the 

 ch^actS £ Pl^amn, but with the nearly erect capsule 

 perf^tlv sniooth on which I have the following note r-Tenollum, 

 ^SrSrwSa P^vis, erectioribus vel subhamatis, longius 



