~ 
1905] * SHOEMAKER—HAMAMELIS VIRGINIANA 265 
6. Cowtes, H. C., The ecological relations of the doen on the sand dunes 
of Lake Michigan. Bor. GAZETTE 27:95. 1899. 
7. Hormetster, W., Neue Beitrage zur Sone der Embryobildung der 
facies: Abhandl. KGnigl. Sachs. Gesell. Wiss. vols. 6 and 
8. LECLERC DU SaBLon, Recherches sur la structure et la déhiscence des anthéres. 
Ann. Sci. Nat. Bot. VII. 1:97-134. 1885. 
9. LEsQUEREUX, LEO, The flora of the Dakota group. Monographs of U. S. 
Geological Survey 17. 1892. pp. 139-14I. 
10. Mout, H. von, Sur la structure et les formes des grains de pollen. Ann. 
Sci. Nat. Bot. II. 3:325. 5- 
tI. es ice Notes on poanne and apr momine Trans. Linn. 
:457. pl. 48. 1862 
12. "ara me Ueber die wnstniiacle Verhiltnisse der Hamamelidaceae mit 
Riicksicht auf ihre systematische Gruppirung. Bot. Jahrb. 11: 347-395. 
88 
~ 2, 1BBp. 
13. THOUVENIN, Maurice, Recherches sur la structure des Saxifragées. Ann. 
Sci. Nat. Bot. VII. 12:135-147. 1890. 
14. VAN TIEGHEM, Px., Seconde mémoire sur les canaux sécréteurs des plantes. 
n. Sci. Nat. Bot. VII. 1:1-96. 1885. 
15. GOEBEL, K., Outlines of classification and, special morphology. 1887. 
16. LE Maout Et DECAISNE, Traité général de botanique. 1865. 
17. Battton, H., Histoire des plantes 3:389-465. 1872. 
18. NIEEnzv, Fr. , Hamamelidaceae, rere and Prantl’s Natiirlichen Pflanzen- 
familien 324: 115-130. 
EXPLANATION OF PLATES VI AND VIL. 
All figures were drawn with a Sale camera lucida, and are of Hamamelis 
virginiana unless otherwise stated. The magnifications indicated are those of 
i reduced plates; those of Plate VI having been reduced one-half, and those - 
f Plate VIT one-fifth. The abbreviations are as follows. ar, archesporium; 
is, br?, br3, first, second, and third bracts; c, carpels; ccs, chalazal conducting 
strand; ct, condos tissue; em, embryo; en, endosperm; ep, epidermis; ¢s, 
: embryo sac; j/, funiculus; ff, fibrous layer; gw, generative nucleus; 7, inner 
integument; m, Ciera BN. n, nectaries; mu, nucellus; of, outer intégu- 
ment; ov, ovules; p, petals; pm, pollen mother-cells; pf, pollen tube; s, sepals; 
St, stamens; 1, peen: ae vascular bundle; vm, vegetative nucleus. 
Fic Growing stamen; longitudinal section. * 550. 
Lal 
2. Growing stamen; trans section. X 550 
Fic. 3. Tapetum and pollen mother-cells. < 550 
Fic. 4. Anther wall showing a eration. X 220. 
Fic. 5. Mature anther; matic transverse section. X 35- 
Fic. 6. Mature anther eae longitudinal section. 35 
Fic. 7. Mature anther, open; diagrammatic transverse section. X 35. 
