10 



SMITHSONIAN* MISCELLANEOUS COLLECTIONS VOL. 85 



LEPTODONTIUM ANGUSTINERVE Ther., sp. nov. 



Puebla: Esperanza (4741 ;4743). 



Sterile. Caespites sat densi, intense virides. Caulis 4-5 cm. longus, 

 simplex vel parce ramosus, laxe foliosus. Folia sicca erecta, parum 

 patula, flexuosa, madida patula, oblongo-lanceolata, sensim acuminata, 

 acuta, carinata, decurrentia, marginibus integerrimis, in medio retiexis. 

 1.2 mm. longa, 0.3 mm. lata ; costa basi 45 /x, percurrente, dorso papil- 



4 



I 



Fig. 5. — Lcptodontium angustincrve Ther. i, 2, cauline leaves; 3, acumen; 

 4, middle cells ; 5, basal cells ; 6, papillae from the dorsal side ; 7, cross-section 

 near the lower third of leaf ; 8. 9, fragments of 7. 



losa; cellulis laminae quadrato-hexagonis, incrassatis, 12x10 /a. pa- 

 pillosis, papillis 1-2, elatis, obtusis, cellulis apicalibus laevibus, cellulis 

 basilaribus rectangularibus. incrassatis, laevibus. 



This species is rather close to L. filcscciis Hampe, but is distin- 

 guished by the narrow acute leaves, the narrow costa, the incrassatc 

 cells with only i or 2 large papillae, the smooth apical cells, and the 

 more compact basal areolation. 



LEPTODONTIUM ARSENEI Ther., sp. nov. 



Morelia: Cerro San Miguel (5073). 



Sterile. Caespites sat densi, compacti, fusco-virides. Caulis 4-5 cm. 

 altus, dense radiculosus, regularitcr foliosus. Folia sicca crispula, 

 humida patulo-squarrosa, vaginantia, e basi erecta, breviter oblonga, 

 sui)ernc dilatata, sat abrupte in acumen angustum, canaliculatum, sub- 

 obtusum contracta, marginibus intcgris, in medio folii revolutis, 

 1.3 mm. longa, 0.5 nun. lata; costa basi 70 /x. percurrente, dorso pa- 



