324 



Alexander W. Ex 



ovate, 0.45 X 0.25 mm., more or less inflated in basal and carinal portions, 

 keel straight or sligtly arched, free margin curved, slightly involute at the 

 base, apical tooth blunt, three or four cells long, usually tipped with two 



Figure 8. — Dicranolejeunea rotundata Evans 



A. Part of a floriferous shoot, with a primary inflorescence and two sec- 

 ondary inflorescences, postical view, X i?- B. Secondary inflorescence 

 with one innovation, the underleaves dissected away, postical view, X 17- 

 C. Part of a shoot showing the base of a branch of the Frullania type, post- 

 ical view, X 17- D- UnfertiUzed secondary inflorescence, the bracteole 

 dissected away, postical view, X 17- E. Two leaves, antical view, X 17- 

 F. Cells from the middle of a lobe, X 225. G. Apical tooth of a lobule, 

 X 225. H. Proximal tooth of a lobule, X 225. I, J. Bracts from a primary 

 inflorescence, X i?- K. Bracteole from another primary inflorescence, 

 X 17. L. Transverse section of a perianth in the upper third, X 17- The 

 figures were drawn from the type specimen. 



superimposed cells or with two cells side by side, proximal tooth shorter but 

 usually tipped with two superimposed cells; lobule often poorly developed, 

 with indistinct teeth or even entire on the free margin ; cells of lobe plane 

 or nearly so, averaging 15 ^ at the margin, 35 X 27 u in the middle, and 

 40 X 30 jU at the base, thin walled, trigones small, triangular, intermediate 



