32 



MUSCI. 



8. P. robust cm Sell, in herb. — P. Schlumberfreri 



lon- 



gioribus, rete laxiore cellulis latioribus composito; lamellis brevioribus parce cellulatis apice geminatis 

 obteclis; margine minus membranaceo dentibus remotis forte spinosis; capsula crassiore sicca deoperculala 



ourystoma. 



In Mexico (Liebmann in herb. Mus. Par.). 



9. P. ERiciFouuM Besch. (P. Orizabanum Besch. prius.) — Dioicum; caulis elatus simplicissimus, vel 

 summo apice parce divisus basi nudiusculus, foliis squammiformibus dense appressis; folia caulina lineari- 

 lanceolata e basi usque ad medium recurva, apice plana, serrata, sicca flexuosa , viridia , erecto-patula , limbo 

 subtus laevi, costa lamellis numerosis apice divisis dorso serrata. Calyptra fere ut in Pogonato alpino. Capsula 

 in peel icello /i-5 cent, longo, inclinata saepe suberecta, longe cylindrica e medio amplior, mollis, collo de- 

 fiuente, sporis impleta viridi-lutescens, vacua atra. Operculum e basi plano-convexum , rostro brevi obliquo. 



Orizaba (BoURG. n° 3s 9A). 



Pogonato alpino proxhnum, ab eo tamen capsula graciliore, caule minus ramoso, foliorum lamellis apice 

 nunc integris, nunc bifidis recedit. 



10. P. cylindriclm Sch. in herb. — Pogonato ericifolio simillimum, sed foliis longioribus angustio- 

 ribus pi an is, capsula graciliore cylindrica, collo tumido. 



Orizaba (F. Muller in herb. Schimper). 



Species non satis nota 



11. P. macropogon Scb. in herb. 



Vera Cruz (F. Miller in herb. Schimper). 



Genus III. POLYTRICHIA Dill. 



1. P. JiMPERiFORME Scb. in herb. — Dioicum ; P. juniperino simillimum; folia patentia, longiora, su- 



perna dorso parce obtusa, dentata, margine usque ad apicem late involuto, integra vel subcrenulata, cuspide 



brevi parce dentata; costa lamellosa, lamellis e cellulis uniseriatis non apice bifidis compositis, perichaetialia 



intima membranacea, costa tenui elamellosa, apice in aristam longissimam integerrimam crispatam producta, 



externa lamellosa. Capsula cubico tetragona, erecta vel horizontals, apophysi solida; operculo breve conico, 

 obtuse apiculato. 



Orizaba (F. Muller; Bourg. n° 2760). 



2. P. Ghiesbreghtii Besch. — Dioicum; caulis minus vel elongatus; folia appressa strictissima , integra, 

 margine late involuto, cuspide dentata. Perichsetialia superne lamellosa. Capsula stricta vel horizon talis 

 ovato-cylindrica sub ore coarctata, leviter 4-costata, operculo longe cuspidato recto vel subcurvulo; calyptra 

 rufa vix capsulam obtegente. 



Mejico (Ghiesbreght, i8/i5, in herb. Mus. Par.). 



Habitu P. communi simillimum, sed foliis integris, lamellis apice haud bifidis, capsula leviter costala. 



3. P. subflexuosim Ltz Pugill. — Elatum 6-unciale; caules subsimplices basi nudiusculi, supra foliis 



siccis, erectis, strictiusculis, udis patentissimis obsili. Folia e basi subquadrala lanceolata, planissima, ultr; 

 medium margined dorso serrata, costa robusta, totam fere folii partem superiorem occupanle. Perichaetialui 

 caulinis similia. Capsula in pedicello brevi, e basi aequali elongata, cylindracea, leviler 6-angularis, levilei 

 incurva. Dentes 3a pallidi. 



( 



Piope Mejico (Andrieux). 



> 



lapsula leviter sexangulari-cylindraeea, incurva inter Polytricha singularis, habitu P.Jlexuoso simile. 





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