NO, 4 



MEXICAN MOSSES THERIOT 



21 



valde revolutis, 0.9 mm. longa, 0.4 mm. lata ; costa basi 60 /x, continua, 

 dorse papillosa; cellulis mediis opacis, indistinctis, dense papillosis, 

 diam. 10-12 /x, superioribus minoribus, rete basilari laxiore, pellucido, 

 cellulis rectangularibus, cblorophyllosis, plus minus papillosis, infimis 

 laevibus. Folia pericbaetialia pauca, intima 2 duplo longiora, convo- 

 iuta, longe vaginantia, apice lingulata, obtusa ; pedicellus tenuis, palli- 

 do-luteus, 7-8 mm. longus ; capsula (immatura) minuta, anguste-cylin- 

 drica ; operculum rostratum. Caetera ignota. 



By its slender habit, its loosely foliate stems, and leaves revolute 

 in the upper two-thirds, the present species is immediately distin- 

 guished from B. hypselostegia Card, and B. Muenchii Card., both of 

 which also have obtuse leaves. 



BARBULA (Streblotrichum) STENOTHECA Then, sp. nov. 



Valle de Mexico; Rio Frio, on earth {Bro. Aniahle 1726). 

 Dioica. Caespites sat densi, obscuro-virides. Caulis erectus, flexu- 

 osus, gracilis, remote foliosus, 10-15 ''^''"^- altus. Folia sicca incurvato- 



FiG. 12. — Barhula stenotheca Ther. i, cauline leaf; 2, acumen; 3, mtdlaii 

 leaf cells ; 4, basal cells ;_ 5, 6, cross-sections of leaf ; 7, cross-section of costa 

 near base; 8, 9, perichaetial leaves; 10, dry capsule; 11, calyptra; 12, peristome. 



crispata, madida patula, oblongo-lanceolata, subobtusa, breviter apicu- 

 lata, marginibus integris, usque ad apicem revolutis, 2 mm. longa, 

 0.6 mm. lata, costa valida, basi 60 {x crassa, dorso laevi, breviter ex- 



