—33— 
the bracts are often perfectly entire at the apex an occasional lobule shows a very 
shallow apical sinus with rounded lobes. So far as the lobules are concerned 
there is an abrupt transition between the lowest bract, the lobule of which has 
an entire margin, and the uppermost v^egetative leaf, the lobule of which bears 
from five to seven teeth. The only perianths seen were imperfectly developed 
and did not project beyond the bracts. They show an oblong to obovate out- 
line and are slightly compressed, but they are characterized chiefly by their ten 
narrow folds separated by deep grooves, the folds being rounded rather than 
sharp (Fig. 15). 
In the original account of P. heterophyllus it was compared with the South 
America P. torulosus (Lehm. & Lindenb.) Trevis., a somewhat larger plant with 
relatively broader leaf-lobes. It was shown that the two species had many 
feature, in common and an additional resemblance is supplied by the per- 
ichaetial bracts and perianths, as a comparison of the figures in the present paper 
with Schiffner's figures of P. torulosus will clearly show^^. In both species the 
lobules of the bracts are nearly as long as the lobe and the perianths are ten- 
plicate. In P. torulosus, however, the lobes of the bracts are much broader at 
the apex, which is either rounded or truncate, the bracteole is relativel> broader, 
and the folds of the perianth are separated b> shallower grooves. 
Sheffield Scientific School, 
Yale University 
Explanation of Plate I 
DiPLOPHYLLUM Andrewsii Evans 
Fig. I. Part of a plant bearing a male inflorescence and giving rise to a female branch with a 
perianth, dorsal view, x 15. 
Fig. 2. Male inflorescence with vegetative proliferation, dorsal view, x 25 
Fig. 3. Another male inflorescense with vegetative proliferation, dorsal view, x 15. 
Fig. 4. Female branch with perianth, dorsal view, x 15. 
Fig. 5. A leaf, spread out, x 25. 
Fig. 6. Cells from the middle of a ventral lobe, x 265. 
Fig, 7. Cells from the apex of a ventral lobe, x 200. 
Fig. 8. Cells from the base of a ventral lobe, x 200. 
Fig. 9. Perichaetial bract, spread out, x 15. 
Fig. 10. Cross-section of a perianth in upper third, x 35. 
Fig. II. Teeth from the mouth of a perianth, x 200. 
Figs, i and 2 were drawn from the Tennessee specimens and all the remaining figures from 
the type specimen. 
Ptychocoleus HETEROPHYLLUS Evans 
Figs. 12-14. Innermost bracts and bracteole from a female inflorescence, x 25. 
Fig. 15. Cross-section of a perianth in upper third, x 45. 
The figures were all drawn from the Nicaragua specimens collected byK. Hamilton (No. 225). 
Hedwigia 33: pi. 7, f. 8-10. 1894. 
