NO. 4 



MEXICAN MOSSES — THERIOT 



29 



Dioica. Caespites laxi, virides. Caulis brevis, 5 mm. longus, superne 

 innovationibus elongatis, 10-15 mm. longis, in axillis foliorum superi- 

 orum propagula fusca, numerosa, su])gIobosa gerens. Folia sicca 

 erecta, parum flexuosa, hmnore erecto-patula, ovato-acuminata, 1.2-1.5 

 mm. longa, 0.5 mm. lata, marginibiis planis, interdum anguste revo- 

 lutis, elimbatis, integerrimis, apice denticulatis ; costa basi 60 /x, sen- 

 sim attenuata, ante apicem evanescente ; cellulis anguste rhomboideis, 

 chlorophyllosis, y o-go fiX S-g fi, ad marginem angustioribus ; folia in- 

 novationis similia sed minora. Folia perichaetialia longiora, ovato- 

 lanceolata, acuminata, intima anguste lanceolata, tenui-acuminata, 

 marginibus revolutis, costa percurrente ; pedicellus flexuosus, 20-25 

 mm. altus ; capsula suberecta vel inclinata, oblonga collo breviore 

 attenuata ; operculum convexum, mamillatum ; annulus latus ; exo- 

 stomii dentes pallidi. baud marginati, dorso inferne laeves, superne 

 papillosi, 0.27 mm. alti, membrana ad ^ dentium producta, processus 

 lineares, fugaces, cilia rudimentaria ; sporae diam. 12-15 /*• 



Very close to W. didymodontia (Mitt.) Brotb., which is distin- 

 guished at a glance by its globular capsule. 



BRACHYMENIUM (Dicranobryum) SAINT-PIERREI Ther., sp. nov. 



Valle de Mexico : Contreras, on earth ; leg. Mar ins Saint-Picrrc 

 {Bro. Amahle 1338 p. p.). 



Dioicum. Caulis brevis, 2-3 mm. altus, inferne denudatus, inno- 

 vationibus numerosis, clavatis. Folia sicca apprcssa. oblonga, breviter 



Fig. 18. — Brachymcnmm Saint-Picrrci Ther. i, plant at natural size; 2, stem 

 leaf; 3, median cells; 4, lower leaf of innovation; 5, tipper leaf of innovation; 

 6, median cells; 7, marginal cells; 8, basal cells; g, moist capsule; 10, oper- 

 culum; II, fragment of annulus. 



