292 MUSCI PR^ETERITI. 



instar), pendula, sub ore valde constricta ; operculo exacte conico ; 



peristomio subhevi. 



PL Mullerianiim, Schinip., a. PL Borreriano differre videtur 

 colore flavido ; caule tenui bipollicari fastigiatim ramoso ; foliis 

 angulo acutiore patentibus, dein deflexo-subsecundis, peranguste 

 ovato-lanceolatis, 4-plo longioribus quam latis, sensiin tenui- 

 acaminatis integerrimis enerviis ; cellulis iis PL Borrer iani con- 

 formibus, alaribus autem nullis ; (capsula inclinata tenui, sicca sub 

 ore constricta ; operculo rostellato). 



PL piliferum, Sw., pro foliis PL Borreriano interdum baud 

 absimile, monoicum est, semper copiose fertile ; foliis in cuspidem 

 piliformem flexuosaru abrupte attenuatis, subenerviis ; capsula 

 brevipedicellata suberecta tenera in sicco corrugata vel substriata ; 

 operculo brevi-conico ; peristomio interno basi ad i alt. solum 

 integro, ciliolis subnullis. 



PL depression, Bruch, et PL deplanatum, Sell., facile distincta 

 sunt foliis apice latioribus, reti minus denso ; capsula inaequali 

 sicca sub ore constricta ; operculo rostrato. 



Tins moss first attracted my notice in the winter of 1845-G, 

 when residing in the Pyrenees at Bagneres-de Bigorre, near which 

 town it grew on the borders of shady walks on the little hill called 

 Mont Olivet. On my return to England in April, 184G, I visited 

 Tunbridge Wells, in company with Messrs. Borrer and Jenner ; 

 and, whilst herborising at Eridge Bocks, Mr. Borrer brought to me 

 a silvery-green patch of moss he had just torn from the horizontal 

 face of a crumbling sand-rock, and asked me to name it. " Why, 1 ' 

 said I, " this is exactly the Hypnnm that has been puzzling me at 

 Bagneres — it is neither denticulatum nor ciipressiforme — it must be 

 new, and we will call it Hypnwn Borrerianuni.'' . M That," he 

 replied, " will be an unfortunate name to give it, for nothing named 

 after me has ever proved permanent — not even either of the two 

 genera, Borrer a and Borreria." However, having carefully studied 

 it, and satisfied myself it was distinct from everything else I 

 possessed, or could find described, I gave it under that name to my 

 botanical correspondents, and especially to Messrs. Taylor, Wilson, 

 and Montagne. To Dr. Montagne I gave also a specimen of the 

 Pyrenean plant, and when, not long afterwards, he lent his moss- 

 herbarium to Carl Miiller (then occupied in elaborating his 

 1 Synopsis Muscorum '), my specimens of H. Borreriamtm, but 

 especially those gathered at Tunbridge Wells, were the materials 

 on which Mr. Miiller founded his description of the species— the 

 first ever published (Syn. Muse, ii., Sept., 1851). 



Iu the succeeding months of the year 1846 I found the same 

 moss growing abundantly in the Castle-Howard woods, especially 

 on sandy declivities, and even on old stools of Car ex panicitlata in 

 Terrington Can- ; and in December, 1847, I gathered very luxuriant 

 specimens, but still sterile, in Arncliffe Wood and Cronkley Gill, 

 Eskdale, growing on decayed vegetable matter about tree-roots and 

 in clefts of rocks. I received it also from Congleton Clough, 

 Cheshire, and from Wales (Wilson, 1846) ; from Stansfield Moor, 



