194 The Botanical Gazette. [April, 
EXPLANATION OF PLATES XV anp XVI. 
Plate XV. 
Plagtochila Columbiana Evans.—Fig. 1. Plants, natural size.—Fig. 2 
Part of stem, antical view (x 6).--Fig. 3. Part of stem, postical view 
(x 6).—Fig. 4. Underleaf, small, normal form (X 32).—Figs. 5-9. Un- 
derleaves, larger form (Xx 12).—Fig. ro. Cells from middle of leaf 
—Fig. 17. Cells from middle of leaf bi 200). : 
Plagtochtla Sullivantii Gottsche.—Fig. 18. Plants, natural aint 
19. Part of stem, postical view (X 12).—Fig. 20. Part of stem, anti 
view.—Fig. 21. Cells from middle of leaf (X 200). 
Fig. 19, from Musci Alleg. 2. 279; fig. 20, from Hep. Bor. Amet. Ms 
after a drawing by W. H. Pearson; figs. 18 and 21, from Connecticl 
specimens, collected by the author. 
Plate XVI. 
.2 ; 
Plagiochila Ludoviciana Sull.—Fig. 4. Plant, natural size —Fig § 
Part of stem, antical view (x 12)—Fig. 6. Part of stem, postical vi 
A 18) Tig. 7, . OT 
nderleaves, larger form (x 32).—Fig. 11. Cells from middle of leat 
(x _200).—Fig. 12. Part of leaf, showing propagula (X 32). Jois: igs 
Figs. 4, 8-11, from Louisiana specimens, collected by Langlo's; 
—Fig. 15. Part of stem, postical 
12).—Fig. 16. Leaf, poeticat view ° 2).—Fig. 17. Leaf, latera 
X 32).—Fig. 18. Underleaf, lateral view (X 32).—Fig. 19- 
middle of leaf (X 200). All 
