TABLE OF CONTENTS. 



BotaDy at the University of Pennsylvania (with plates i-v 



and illust.) • * 



Development of cork-wings on certain trees (illust.) IV, V 



Emily L. Gregory. 5, 37 



The " King-Devil " . . . . Lester F. Ward. 10 

 Undescribed plants from Guatemala, VI. (plates vi, vn) 



John Donnell Smith. 25 



On Cuscuta Gronovii (plate vin) Henrietta E. Hooker. 31 



Notes on North American mosses, I. Charles R. Barnes. 44 

 Notes on North American willows, III, IV. (plate ix) 



M. S. Bebb. 49, 115 



Intracellular pangenesis . . * • J. W. Moll. 54 



Our worst weeds 



uit of Monstera (plate x) 



W. S. Windle. 67 



Byron D. Halsted. 69 



Manihot) . H. W. Wiley. 71 



Histology of the leaf of Taxodium, I, II. (plate xr) 



Stanley Coulter. 76, 101 



New mosses of North America, II. (plates xn-xiv) 



F. Renauld & J. Car dot. 91 



The diatom marshes and diatom beds of the Yellowstone 



National Park 



H. Weed. 117 



Char 



1888 



Notes on the flora of Iowa . . A. 8. Hitchcock. 127 



Subepidermal rusts (plate xv) . • H. L. Bolley. 13' 



Achenia of Coreopsis (plate xvi) . JN. Rose. 145 



Notes on cultures of Gymnosporangium made in 1887 and 



Roland Thaxter. 163 



• • * ' 



Notes on fungi, I W. G. tarlow. 1$~ 



Notes on our Hepaticro . . Lucien M. Underwood. 191 

 The uredo-stage of Gymnosporangium (plate xvir) 



H. M. Richards. 21 1 



Observations on the temperature of trees (plate xvin) 



H. L. Russell. 216 



