334 



IOWA ACADEMY OF SCIENCE Vol. XXV, 191S 

 VITAGE^. 



Vitis vulpina L. Lubbock^* describes germination of V. hypo- 

 glauca and V. cebeivnensis. G-ermination epigreous, cotyledons 

 long, stalked, broadly ovate to cordate in outline, fleshy, lower 

 and upper surfaces smooth, petiole reddish, grooved, stem above 

 the cotyledons reddish, slightly pubescent. First leaf palmately 



Fig. 110 



Fig. Ill 



Fig. 110. — Seedling of Vitis vulpina, showing cotyledons. Pliotograpliel 

 by Photo. Section, P. E. Colbum. 



Fig. 111. — ^Young germinating basswood {Tilia americana), the thick 

 radicle, caulicle, and deeply toothed petioled cotyledons, first leaf coarsely 

 toothed. Photographed by Photo. Section, F. E. Colburn. 



three-nerved, veins reddish at lower end. Upper surface smooth, 

 shining, bearing pubescence, margin coarsely dentate. Petiole 

 of first leaf pubescent, enlarged at base. Trichomes several- 

 celled, base fairly broad, gradually tapering to the apex, which 

 is somewhat rounded. Protoplasmic contents granular, with a 

 rather small nucleus, Contents reddish, walls rather thin. 



'^Some contributions to our knowledge of seedlings, 1, pp. 348-350. 



