ICONES MUSCORUM. 



ORTHOTRICPIUM WATSONI, James. 



Tab. 54. 



Plants laxe pulvinatae, virides, inferne dilute ochraceae. 



Caulis subiincialis, parciiis divisus. 



Folia molliora, laxiuscula, e basi erecta hyaliim elongato- 

 lanceolata, aciitata, eximie arcuato-recurva, carinata, toto mar- 

 giue revoluta, cellulis snperioribus punctiformibus papillosis 

 areolata, papillis longiusculis bi-trifurcatis. 



Flores moiioici : masculi cum perichaetio terminales. 



Capsula emergens, subelliptica, sicca promiueiiter costata, sub 

 ore amplissimo coustricta, haploperistomata, dentibus Igevibus 

 geminatim arete connatis flavesceuti-albidis T-10-articulatis ; 

 ciliis robustis punctatis ; calyptra satis ramcntosa ; operculo 

 brevius rostrato. 



Orthotrichum Watpoxi, James, in Wats. Cat. U. S. Explor. Exp. 40th 

 Paral. CI. King, 5. p. 401. 



Hab. On damp sbaded rocks iu the West Humboldt Moun- 

 tains, Nevada, at 5,500 feet altitude, S. Watson. 



This species is allied to 0. Tfxamim, Sulliv. ; but its color is 

 different; its leaves are broader, softer, and much more re- 

 curved, and the cells of the upper half of each leaf are covered 

 with longer and more or less divided papillae. The teeth of the 

 peristome are yellowish white, with a tendency to separate as in 

 0. Texaymm. 



TAB. 54. — Orthotrichum AYatsoni. 



1. Plant£e naturali magnitudine. 



2. Pars caulis cum capsula et foliis. 



3. Folii. 



4. Sectiones transvcrsales foliorum. 



5. Areolatio basilaris et apicialis folii. 

 5 bis. Capsula operculata cum vagi- 



nula et gemma mascula. 

 10 



G. Capsula vacua, sicca. 



7. Pars perixtomii. 



8. Areolatio et stoma capsulse. 



9. Calyptra. 



10. Gemma maFcula. 



11. Folium perigoniale. 



12. Antheridium et paraphysis. 



