NO. 4 



MEXICAN MOSSES THERIOT 



ir 



pillosa, cellulis laminae opacis, vix distinctis, quadratis. 7-8 fx, dense 

 et tenuiter papillosis. cellulis basilaribus juxtaniarginalihus linearil^us, 

 laevibus. hyalinis, internis rectangularihus, papillosis, paulum chlOro- 

 phyllosis. 



Fig. 6. — Lcptodoiitiuin Arscnci Ther. i, 2, 3, cauline leaves; 4, cross-section 

 in the acumen ; 5, fragment of 4 ; 6, upper cells ; 7. cells in the upper part of 

 leaf base toward a ; 8, marginal cells of leaf base at /'. 



This species also belongs to the group of L. filcsccus. It may l)e 

 separated from it by the more elongated stems, by the leaves w'ith a 

 short sheathing base, by the narrower acumen (subobtuse and not 

 apiculate), and the smaller median cells. 



LEPTODONTIUM FILESCENS (Hampe) Mitt. Muse. Austr. Amer. 50. 1869 

 Valle de Mexico ; Desierto, upon bark associated with Rocca stricta 



Besch. (Bro. Ainable 1444). 



A Colombian species, new to Mexico. 



LEPTODONTIUM SQUARROSUM (Hook.) Par. Ind. Bryol. 732. 1896 

 Holomitrium scrratum (Schimp.) C. M. Syn. 2: 587. 1851. 



Valle de Mexico {Bro. Aiiiablc) : Desierto (1431); Rio Frio 

 (1396). 



The last plant is a form with strongly undulate leaves. 



LEPTODONTIUM EXASPERATUM Card. Rev. Bryol. 36: 74. 1909 

 \^alle de Mexico: Rio Frio (Bro. Auiahlc 1690). 



LEPTODONTIUM sp. 



\'alle de Mexico {Bro. Aiiiable) : Puenta de la W'nta (1391): 

 Desierto (1439 P- P-)- 



The present species, which unquestionably is new, was recognized 

 as such independently by my friend Edwin B. Bartram, who will 

 shortly publish a description. 



