Bryum castaneum n. sp. 



Cæspites ad 2 cm. alti, densiusculi, rigidiusculi, intus decolorato- 

 luridi, apicem versus nigricantes, summitate olivacei. 



Surculus innovationes binas ad 8 mm. longas sub apice pro- 

 ferens, tomento atro-fusco ramosissimo papilloso dense vestitus, 



Caulis 0.3 mm. crassus, atro-violaceus, ille innovationum læte 

 ruber, sectione transversa pentagonus, basibus foliorum decurren- 

 tibus alatus, fasciculo centrali 0.06 mm. diametro metiente, reti 

 ceterum laxo, tenuissimo, cellulis strati peripherici minoribus, pauUo 

 magis incrassatis. 



Folia caulina satis remota, sicca erecta flaccideque flexuosa, 

 humida patula — patentia, nonnunquam leniter recurva, distincte 

 quamvis anguste decurrentia, inferiora 2.25 mm. longa, 0.83 mm. 

 lata, ovata — ovato-ovalia, sensim breviter cuspidata, margine 

 plana vel basi late recurvata, distincte limbata; superiora sensim 

 longiora, (ad 3.2 mm. longa,) ovato-lanceolata, longius cuspidata, 

 margine ad basin latiuscule, inde ad medium usque anguste reflexa, 

 limbo distincto instructa, apice dentata, subplana, basi vinosa; 

 cellulæ tenues, basales turgidæ, rectangulæ — elongato-rhomboideæ, 

 0.08—0.14 mm. longæ, 0.03 mm. latæ, in angulis decurrentibus 

 angustissime rectangulæ; in folio superiore elongato-hexagonæ, 

 0.035— 0.056 mm. longæ, 0.017 — 0.023 mm. latæ, margines versus 

 subraptim in limbum transeuntes e cellulis 3- — 4-seriatis lutescen- 

 tibus incrassatis angustissime rhomboideis flexuosis constructum; 

 costa basi rubro-fusca et 0,06 mm. lata, ceterum fuscescens, in 

 foliis inferioribus in summo apice dissoluta, in superioribus nunc 

 continua, nunc breviter excurrens dentata, teres, præsertim superne 

 dorso valde prominens, e cellulis ventralibus 4—5, ducibus 4, 



