457 



Bryum decens Hag. n. sp. 



(Planche XIV, a—h.) 



Cæspites densi, ad 1.5 cm. alti, plani vel parum tumescentes, 

 intus fusci, superne læte vindes. 



Surculus innovationes singulas vel binas usque ad 5 mm. 

 longas sub apice fertili emittens, tomento fusco ramosissimo 

 verrucoso satis copioso tectus. 



Caulis 0.22 mm. crassus, fusco-purpureus, sectione penta- 

 gonus , fasciculus centralis ca. 0.03 mm. crassus , e cellulis 

 leptodermibus corapositus, rete ceterum laxum, undulatum, 

 tenue, in stratis peripherics duobus vel uno paullo densius, 

 intensius tinctum, vix crassius. 



Folia caulina densa, siccitate erecta — appressa, vix 

 crispata, apicalia conniventia, humiditate erecto-patentia, baud 

 decurrentia, inferiora ovato-acuminata, margine plana vel anguste 

 reflexa, baud limbata, costa in apice dissoluta; superiora ex 

 ovato in cuspidem tertiam longitudinis folii partem aequantem 

 lanceolato-subulatam subflexuosam satis cito angustata, 1.9 mm. 

 longa, 0.55 — 0.69 mm. lata, intégra, toto margine late revoluta, 

 limbo male deünito, vix concava, ad basin dilute rubentia; 

 cellulœ in folii parte terlia infima parietibus transversis pertusæ, 

 basales leptodermes, rectangulæ — hexagono-rectangulæ, 0.06 — 

 0.1 mm. longæ, ca. 0.024 mm. latæ, angulares breviores et latiores, 

 tenuissimæ ideoque mox collapsæ ; foliares ceteræ mediocriter 

 crassæ, rhomboideæ — hexagono-rhomboideæ, ca. 0.05 mm. longæ 

 et 0.013 mm. latæ, marginales folii dimidii superioris in series 

 3 — 4 oblique dispositæ, longiores, sed vix angustiores, limbum 

 parum conspicuum formantes; costa ad basin 0.07 mm. lata 

 ibique rubra, ceterum fusco-virens, in cuspidem longiusculam 

 integram excurrens, plano-convexa, dorso valde prominens; 

 cellulæ ventrales 2 — 4, duces 4 ejusdem magnitudinis, fasciculus 

 comitum distinctissimus, ille stereidearum valde evolutus, cellulæ 

 dorsales satis parvæ, 8 — 10. 



