NO. I 



MEXICAN MOSSES THERIOT 



19 



NECKERACEAE 



NECKERA HORNSCHUCHIANA C. M. Syn. 2: 51. 1850 

 Morelia: Cerro Azul (4526). 



NECKERA CHLOROCAULIS C. M. and N. ORBIGNYANA Lor. 



I have tried to differentiate these two species, with the help of the 

 descriptions and the specimens of my collections, but have had little 

 success. Indeed, it is rare to find a specimen which combines all the 

 characters attributed to each species. As a matter of fact, if, among 

 the mosses of Brothers Arsene and Amable enumerated below, I take 

 at random three plants, I cannot find two of them identical. This 

 seems to mean that I have before me transitional forms linking closely 

 the extremes which have received the names A^. chlorocaidis ant/ N. 

 Orbignyana. It is then more convenient, beyond a doubt, to combine 

 these two species under the name N. chlorocaulis C. M., which has 

 priority (1851) over Lorenz's species (1864). 



Puebla: Esperanza (4744, 7977) ; Hacienda Batan (4964, 4965). 

 Morelia: Cerro Azul (4559,4798). Veracruz: Jalapa (7996)- Valle 

 de Mexico: Desierto {Bro. Amable 1213, 1224, 1239). 



PILOTRICHACEAE 



PILOTRICHUM MEXICANUM Ther., sp. nov. 



(Fig. 6) 



Morelia: Loma Santa Maria (4867, 4895, 7869). 

 Sterile. Caulis secundarius 4-5 cm. altus, erectus, irregulariter 

 ramosus, ramis inaequalibus, saepe arcuatis, plerumque simplicibus. 



Fig. 6. — Pilotrichiim mexicanum Ther. i, stem leaf; 2, branch leaf; 3, cross- 

 section of leaf ; 4, apex of a stem leaf ; 5, margin of leaf. 



Folia caulis secundarii erecto-adpressa, late ovata, acuta, concava, 

 longitudinaliter plicatula, 1.5 mm. longa, 0.8 mm. lata, marginibus 

 inf erne revolutis, sequentibus serrulatis, dentibus acutis hyalinis, costis 



