290 MUSCI PKiETERITI. 



toto margine serrulata, basi bicostata (altera costa interdum obso- 

 leta); cellulie snbbreviores subserpentinas, apicales perpaucse breves 

 rhombeas, alares distinct® quadrat® utrinque sub 12. Bracte® 

 $ intern® omnes cuspidat®, cuspide denticulata basi saepe incisa. 

 Capsula in pedicello duplo fere breviore oblongo-cylindrica inclinata 

 subcernua (nunquam horizontalis), siccando arcuata sub ore valde 

 constricta. Operculum brevirostre. Annulus angustus simplex. 

 Peristomium majus, pallidum subbevissimum. 



PL depressum, Brucb., magis ramosum est, densifolium, pro 

 more viridissimum nitidulum. Rami medium versus dilatati. 

 Folia^ apice brevi raro subacuminata, plerumque abrupte acuta, 

 margine supero subdenticulato ; cellul® breviores, apicis triangularis 

 totius subrhombe®, alares distinct® quadrate. Bracteae acurni- 

 nata). Pedicellus brevis apice leniter incurvus. Capsula oblonga 

 vel brevi cylindracea gibba cemuo-inclinata, siccando sub ore 

 constricta, directione immutata. Operculum brevirostre. Peri- 

 stomium pallidum. 



PL Borreiianum, Spruce, a PL elegante magis remotum est; 

 de suis differentiis confer descriptioncm PL Borreriani ad pedem. 



Hooker's figure and description accord sufficiently with Menzies' 

 original specimens, except that — probably from not having 

 thoroughly moistened the pedicel— he has not noticed that the 

 direction of the capsule when fresh is horizontal, although in the 

 dry state it becomes as completely pendulous as that of Brywn 

 cmtpiiicium, in which position his figure represents it. In the only 

 perfect peristome I was able to examine the processes were imper- 

 forate, but Hooker's figure shows them somewhat cloven at the 

 keel, which may have been caused by the pressure of a covering- 

 glass ; or the species is really variable in that particular. 



bchwaegrichen's figure is correct enough as to the foliage, but 

 his account of the fruit must have been drawn up, in part, from 

 that of some intermixed Hypnum of the subgenus Brachythecium, 

 for he says " pedicellus imprimis sicco statu seaber" and " perist. 

 internum eUiis trihus Ungismmu capiUaceis" neither of which 

 characters exists in PL elegant. 



Hypn 



2. Plagiothecium Borrerianum. 



Dioicum, dense depresso-c®spitosum, pallide vel amoene viride 

 mtidissimum, in sicco saepe argenteum raro rutilans. Caules 1-2- 

 polhcares procumbentes laxe pinnatim ramosi, hie illic— e ramoruni 

 basi colorata pr®cipue— radicellas longas flexuosas nigro-purpureas 

 edentes, ramis ascendentibus imbricatis. (E plant® sterilis 

 foliorum axillis pers®pe proferuntur ramuli gracillimi parvifolii 

 fasciculato-5-10ni. decidui). Folia laxiuscule imbricata complanata, 

 lateraha bifana angulp 45°-80° patentia subobliqua, antica pos- 

 ticaque (pauca) appressa symmetrica, omnia hub triplo longiora 

 quam lata, ovato-lanceolata, sensim vel subabropte tenui-acumi- 

 nata cuspulatave, acumine subserrulato stricto vel decurvulo, 

 concavula, margine interne leviter reflexo, costulis, binis brevibus, 



C 



elluhe 



