340 BARTRAM: TORTULA IN SOUTHERN ARIZONA 
Description of plate 6 
Tortula aurea 
Fics. land 2. Dry plants four-fifths natural size. 
Fic. 3. Upper part of moist plant X 12 
Fics. 4 and 5. Stem leaves X 16. 
Fic. 6. Leaf apex X 40. 
Fic. 7. Leaf apex X 80 
Fic. 8. One side of cross-section near middle of leaf 240. 
40. 
Fic. 11. Median basal cells next to costa * 240. 
Tortula alpina 
Fic. 12. Leaf from plant growing on rubble bank in Patagonia Mts., 
siege 16, 
13. Leaf from plant growing on shaded ledges in Santa Catalina 
Mts., tre 16. 
Fic. 14. Leaf from plant growing on rock face in Santa Rita Mts., Ariz. 
Description of plate 7 
Tortula fragilifolia 
Fic. 1. Moist plant four-fifths natural size. 
Fic. 2. Moist plant x 4 
Fic. 7. Propagula x 8o. 
Fic. 8. Basal cells on one side of costa & 8 
Fic. 9. One side of cross-section from lower nie of leaf X 240. 
Fic. 10. Cross-section of costa from upper half of leaf x 240. 
Fic. 11. Upper leaf cells « 480. 
Tortula alpina var. propagulifera 
Fic. 12. Leaf from plant growing on tree in Santa Rita Mts., Ariz., x 16. 
Fic. 4 Leaf from plant growing on tree in Patagonia Mts., Ariz. X 16. 
Fic Leaf from plant growing on rocks at Harpers Ferry, Va. 
T. Beals’ rei 3177 x4 
Fic. 15. Leaf from plant growing on tree, Augusta, Ga. Small Mosses 
of Southern U.S. No. 
Fic. 16. Leaf from cts rawine on ledges in Patagonia Mts., Ariz. x 16. 
Fic. 17. Leaf from 5 growing on tree, Berkeley, Calif. Holzinger 
Musc. Ac. Bor. Am. No. 16, 
