40 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



RHYNCHOSTEGIELLA ARSENEI Ther., sp. nov. 



Puebla: Hacienda Santa Barbara, on sandy ground (739). 



Sterile. Caespites lutescenti-virides, nitidi, Caulis repens, gracilis, 

 laxe foliosus, ramosus, parce radiculosus, paraphyllis raris ; ramis 

 erectis, brevibus, 2-3 mm. longis, sat confertis, sat dense foliosis. 

 Folia caulina et ramea sicca erecto-patula, humida patentia, anguste 

 lanceolata-acuminata, acuta, decurrentia, marginibus planis, toto am- 



FiG. 21. — Rhynchostcyiclla Arsenei Ther. i, stem leaves; 2, apical cells; 

 3, median cells ; 4, marginal cells ; 5, basal cells. 



bitu minute denticvdatis, 0.6-0.7 mm. x 0.2 mm. ; costa basi 30 /a percur- 

 rente; rete opaco, cellulis linearibus, 36-40 ju, x 6 /*, basilaribus sat 

 distinctis, marginalibus subquadratis (2-3 ser.), subhyalinis. 



This species can be compared only with R. Jacquini (Garov.) 

 Limpr. and R. Tecsdalii (Sm.) Limpr. It is distinct from both by its 

 leaves denticulate all around and from the first species also by its 

 larger branch leaves, differentiated basal areolation, and more densely 

 foliate branches ; from the second species by its acute, decurrent leaves. 



EURHYNCHIUM SUBSTRIATUM Then, sp. nov. 



Valle de Mexico: Llano Grande, alt. 3,700 meters, on rocks (Bro. 

 Amahle 1735). 



/{. striata (Schreb.) simillimum differt: statura graciliore, ramis 

 brevioribus, foliis minus profunde sulcatis, caulinis angustius de- 

 currentibus, rete basilari praecipue ad angulos densiore. foliis rameis 

 margine dentilnis brevioribus. 



