212 ICONES MUSCORDM. 



Hypnum Nuttallii is distinguished from Hypnum aureum by- 

 its longer and more erect cylindrical capsule, shorter rostrate 

 operculum, less perfect inner peristome, and especially by its 

 much shorter pedicel and the strongly dentate lower margin of 

 the leaf. 



The same characters, together with its densely pinnate ramifi- 

 cation, separate it from Hypnum lutescens. 



These three species form a very natural group, composing the 

 genus Camptothecium of the admirable Bryologia Europaea, and 

 are remarkable for the presence of small male buds produced 

 from spores, usually in clusters, and evidently parasitic on the 

 fertile plants. The normal inflorescence, however, is said by 

 authors to be dioicous. 



TAB. 128. — Hypnum Nuttallii. 



1. Planta fertilis naturali magnitudine, 



2. Pars ramuli. 



3. Folia ejusdcm. 



4. Areolatio folii baseos. 



5. Eadem apicis. 



6. Cellula; ejusdem. 



7. Sectiones transversalos f'oUi. 



8. Perichaethim. 



9. Folium ejusdem. 



10. Capsular operculatae. 



11. Particula peristomii. 



12. Operculum. 



13. Calyptra. 



11. Pars pedicelli. 



15. Inflorescentia pseudo-monoica. 



Hi. Pars ramuli cum gemmis masculis parasiticis. 



17. Folium perigoniale cum antheridio. 



