NO. I MEXICAN MOSSES THERIOT 1 5 



ORTHOTRICHUM DIAPHANUM (Gmel.) Schrad. Spic. Fl. Germ. 69. 1794 



Bryuin diaphamirn Gmel. Syst. Nat. 2 : 1335. 1791. 



\"alle de Mexico: California {Bro. Amable 1273) ; Tlalparft {Bro. 

 Amahle 1236). 



ORTHOTRICHUM MALACOPHYLLUM Card. Rev. Bryol. 38: 2. 191 1 

 Valle de Mexico: Contadero {Bro. Amahle 1301 in part). 



ORTHOTRICHUM PYCNOPHYLLUM Schimp. 



Puebla: Esperanza (4680) ; Hacienda Batan (4966, 4967). 

 Morelia : Cerro Azul (4794, 4930) . Valle de Mexico : Salazar {Bro. 

 Amahle 1295). 



Brother Amable's material is plentiful, with well-fruited specimens, 

 consequently I was able to make interesting observations and more 

 particularly to ascertain the wide variability of this species. For 

 instance, in the same tuft some plants have immersed capsules and 

 others show them more or less exserted ; sometimes the ripe capsules 

 are entirely smooth and sometimes a little costate ; the segments of the 

 inner peristome may be nearly entire or more or less erose ; finally, 

 the leaves, when moist, are either spreading or strongly squarrose. 



It seems that the individuals with exserted capsules and squarrose 

 leaves should be called O. recnrvans Schimp., and those with immersed 

 capsules O. Lozanoi Card.; but both have a densely villous calyptra, 

 while in 0. recurvans and O. Lozanoi the calyptra is only sparingly 

 villous. 



To what conclusion do these remarks lead if not that the names 

 O. pyciiopliyllum, O. recurvans, and O. Lozanoi have been created for 

 forms of a very variable species and that it is desirable, as Cardot 

 suggested in 1909 (Rev. Bryol. 36: 107), to reunite them under a 

 single name, the one which has priority (O. pycnophyllum Schimp.) ? 



MACROMITRIUM GHIESBREGHTII Besch. Prodr. Bryol. Mex. 44. 1871 



Puebla: Boca del Monte (4685) ; Esperanza (4671, 4676, 4681, 

 4687, 4688, 4756, 4801). 



Nos. 4685, 4687, and 4688 represent forms with shorter branches, 

 with leaves less appressed when dry and more spreading when moist, 

 and with shorter pedicels. 



I recall that Cardot (Rev. Bryol. 38: loi. 191 1) considers M. 

 Ghiesbreghtii and M. Leiboldtii Hampe as mere forms or varieties 



