DUSEN I PATAGONIAN AND FUEGIAN MOSSES. 



8l 



papillosis, siccitate reflexis, ad thecam appressis, internum et dentibus 

 perfectis 8 et dentibus rudimentariis totidem praeditum, his filiformibus ; 

 dentibus peristomii externi paulum brevioribus, laxe nodulosis, laevis- 

 simis, basi dilatatis, siccitate arcuatim inflexis, illis humillimis ; membrana 

 basilari brevissima; operculum paulum convexum, pallide flavum, mar- 

 gine aurantiaco, rostro brevi, crasso, subobliquo, rotundate obtuso cor- 

 onatum ; calyptra sulcata, glaberrima, aureo-nitens, oblongo-campanulata ; 

 spores 0.016-0.020 mm. magnae, papillosae. 



Flos masc. gemmiformis ad basin floris fern, dispositus, bracteis ovatis, 

 concavis, subapiculatis, nervo infra apicem evanido, cellulis omnino sub- 

 rhombeis, laevissimis, parietibus baud vel vix incrassatis. 



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

 in territorio fontinali fluminis Rio Chico lecta est. 



An elegant little species, very distinct and easily recognized by its rudi- 

 mentary inner peristomial teeth, interposed between the perfect ones, and 

 by its shining hairless calyptra. In size it resembles Orthotrichum pumi- 

 lium Sw. and tenellum Bruch. 



ORTHOTRICHUM COMPACTUM Dusen n. sp. 



PL IX, Figs. 1-3. 



Atitoicttm, cryptostomatictmi ; densissime et intricate caespitosum, caes- 

 pitibus humillimis, summitate flavo-viridibus, ceterum fuscis ; caulis erec- 

 tus, longitudine tota radiculosus, apice ramulosus ; folia densissime con- 



FlG. IO. 



a b c d e j 



Orthotrichum compactum Dusen. a, b, folia, - ; c, apex folii, *f- ; d, cellulae apicules, 

 cellulae basales juxta nervum sitae, ^^ ; /", capsula calyptrata humiditate, if-. 



ferta, lineari-lanceolata, c. 1.8 mm. longa et 0.35 mm. lata siccitate 

 appressa, stricta, humiditate e basi erecta patentia, carinata, marginibus 



