858 MTJSCI PR^TERITI. 



valicTa ad vel ultra f procurrente, medio (raro basi) furcata ; cellulis 

 latiusculis PL sylvatici. Ex utraque facie foliorum inferiorum costae, 

 necnon e margine, proferuntur radicella3 valid® purpureas, caulibus 

 foliisque adjacentibus arete adhasrentes. Hab. in rivulis saxosis 

 juxta Bagneres-de-Bizorre Pyrenaeorum centralium, ubi anno 1846 

 amicus Philippe legit. 



Although these two plants can only, I think, be considered 

 varieties of PL sykaticum, the one I am about to describe, which is 

 certainly the PL SuUivantia figured in Sullivant's beautiful ' Icones,' 

 seems distinct ; at least I have seen nothing intermediate. Whether, 

 along with PL Boseanum, Hpe., andP/. orthocladum, Sch., it should 

 constitute a subspecies of PL sykaticum, I cannot undertake to say, 

 my materials being insufficient. 



4. Plagiothecium Sullivanttje, 8chimp. 



Hypnum SuUirmtia;, Sch., Sulliv. Mosses of the U. States, 

 p. 80, 1856), etiam • Icones Muscorum,' p. 207, t. 126 (a. 1864). 



Dioicum caespitosum pallide viride, basi rufescens, in sicco 

 nitens, Caules pollicares erecti fastigiatim ramosi, basi aphylla 

 uagella radicantia demittentes. Folia undique imbricata, vix 

 subcomplanata, ramorum apices versus confertiora, basi angusta 

 subtransversa inserta, omnia fere symmetrica, ovata et ovato- 

 lanceolata, concava, inferiora persaepe striata, sensim acuminata et 

 longiuscule apiculata cuspidatave ; margine a basi ultra medium 

 reflexulo; costis binis ad folii i productis ; cellulis angustis 

 ( T V X T ' 5 mm.) ; alaribus paucis subquadratis. Bractese erecto- 

 appressaa interiores foliis longiores oblongae cuspidato-acuminataa, 

 costa nulla vel simplice latiuscula obscura ad \ usque percursae. 

 Bedicellus polhcans rufus. Capsula rufula longicolla suberecta vel 

 leniter inchnata, Operculum (ex ic. Sullivantii) a basi alte conica 

 obtuse brevirostre, dimidiam capsulam baud excedens. Annulus 

 simplex duplexve. Peristomium pallidum scaberulum ; processus 

 in term carina mtegri vel in aatate hiantes, ciliola l-2na. 



Hab. ad saxa in sylvis densis fl. Ohio (SuUivant). In regione 

 Pyrenaeorum sylvatica superiore ad saxa juxta lacum Seculego, 

 mense Sept., 1845, ipse legi, fructu jam supramaturo. Ad Kirk- 

 stone Pass, Westmorlandi© plantam $ sterilem, m. Juni, 1876, 

 invenit am. G. Stabler. 



Forsan a PL Romano (Hpe.), Br. Eur., t. 504, haud distincta 

 species, nil tamen tributa sunt folia « costa maxime obsoleta," 

 quum m nostra foha costis optime distinctis gaudent. A PL sylvatico 

 loins vix complanatis, omnibus fere symmetries, nitidis (nee opacis 

 et lusciduhs), cellulis dimidio augustioribus ; operculo breviore, 

 etc. facile distmctum mihi videtur ; et a PL dentkulato florescentia 



rf"^ yx "*_^t ^** ^Lt >-* A. . 



constmter dioica. 



5. Fisside.vs HoiiOMiTiurs, n. sp. 



Monoica pusilla pallida, gregaria vel laxc crespitosa. Caules 

 brevissimi declmati, nisi pro ramulo masculo basah gemmiformi 

 simphces. Foha 5-juga, infima minuta, superiora valdeincrescentia, 

 lineari sublalcata acuminulata cuspidatave, costa pellucida et Umbo 



