62 ICOXES JIUSCORL'M. 



Amcricaiii. In the var. /3 and 7, as in that under notice, the 

 lamellar appendages at the exterior base of the teeth of the 

 peristome are absent, and the markings of the teeth themselves 

 are quite different from those in the type. 



In much the larger number of species of Orthotrichutn, the 

 markings of the teeth peculiar to each species are constant and 

 afford reliable distinctive characters. In a few species, however, 

 such as 0. rupestre, 0, urnigerum, and 0. cupulatum, this con- 

 stancy (at least in American forms) does not prevail. 



TAB. 44. — Orthotrichum cupulatum, var. 



1. PlantEC naturali magniludine. 



2. Planta cum capsula. 



3. 4, 5. Folia, eorumdem areolatio et sectio transversalis. 



6. Pats caulis cum capsula et lluribus masculis. 



7, 8 Capsula operculata, eadeuniue vacua. 

 9. Operculum. 



10. Peristomii denies. 



11. Gemma mascula, antlieridium, et paraphy.sis 



12. Calyptra. 



13. Areolatio capsular. 



