82 PATAGONIAN EXPEDITIONS I BOTANY. 



vulgo planis, rarissime plus minusque reflexis, carinate nervosa, nervo basi 

 0.06 mm. crasso, infra apicem desinente ; cellulse laevissimae, basales rec- 

 tangular, medianae rotundate rectangular vel rotundate quadratae, apicales 

 ovales vel rotundatae, c. 0.013 mm. magnae, parietibus omnino valde in- 

 crassatis; bractece perichcetii foliis caulinis similes; seta c. 1.4 mm. alta; 

 theca oblonga-ovalis, c. 1.5 mm. longa et 0.55 mm. crassa, siccitate 8-sul- 

 cata, pallide flava; peristomium pallide flavum, externmn dentibus 8, 

 bigemmatis, 0.19 mm. altis et basi o. i mm. latis, minutissime papillosis, 

 siccitate valde reflexis, ad thecam appressis, intermtni dentibus 8, dentibus 

 endostomii aequilongis, subulatis, laevissimis ; operculum depresse coni- 

 cum, rostro crasso, diametro capsulae breviore, recto, obtuso coronatum ; 

 sporae c. 0.016 mm. magnae, papillosae. 



Hab. speciei, Patagonia australis in truncis arborum, ubi verisimiliter 

 in territorio fontinali fluminis Rio Chico lecta est. Resembling Orthotri- 

 chum macloskii Dusen, but more densely tufted, differing from that spe- 

 cies by the absence of rudimentary inner peristomial teeth, interposed be- 

 tween the perfect ones, and by the non-papillose cells of the leaves. 



ORTHOTRICHUM RUPESTRE Schleich. 



Hab. Patagonia australis in territorio fontinali fluminis Rio Chico, ubi 

 in consortio Barbulce flagellaris Schpr. ad basin arborum occurrit. 



Gen. ULOTA. 



ULOTA HAMATA Dusen n. sp. 

 Pi. IX, Fig. 4 . 



Autoica, phanerostoniatica ; dense caespitosa, humilis, lutescente viridis; 

 caidis repens, sat dense ramosus, rami erecti plerumque simplices, usque 

 ad 6 mm. alti \folia dense conferta, subuncinati, omnino apice hamata, sicci- 

 tate erecta vel suberecta, vix crispata, humiditate patentia, c. 1.8 mm. longa 

 et basi 0.33 mm. lata, e basi dilatata, breviter ovali, concava elongate lan- 

 ceolata, subcanaliculata, emarginata, marginibus planis, plus minusque dis- 

 tincte crenulatis ; nervo basi 0.02 mm. crasso, longe infra apicem evanido ; 

 cellulce parietibus valde incrassatis, pellucidae, basales anguste elongatae, 

 marginem versus breviter rectangular, ceterae rotundatae, c. 0.135 mm - 

 magnae, subpapillosae ; bractece perichcetii foliis caulinis similes, sed paulum 

 majores ; seta stricta, usque ad 5 mm. alta ; theca (vetusta) humiditate 



