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1917] CURRENT LITERATURE 527 



Extending their work to angiosperms, Tupper and Bailey" found the 

 average length of their wood elements to be twice that of the corresponding 

 structures in gymnosperms except in the vesseliess angiosperms, Tetracentron, 

 Trochodendron, and Drimys, which seem to have the typical gymnospermous 

 length of wood elements. More recently, Pritchard and Bailey 1 * examined 

 Carya ovata and reached the general conclusion that both in conifers and in 

 woody dicotyledons there is a period in the early stages of the life history during 

 which the woody elements increase in size comparatively rapidly, the length 

 of the period varying in different groups. Furthermore, different types of 

 xylem elements, such as tracheids, wood fibers, and vessel segments, behave 

 very differently, but their size generally fluctuates more or less during the later 

 stages of the development of the stem. — Geo. D. Fuller. 



Taxonomic notes. — Cook 14 has made a comparison of the peculiar branch- 

 ing and flowering habits of Cacao {Theobroma cacao) and Patachte, formerly 

 referred to Theobroma, but recently made the basis of a new genus (Tribroma) 

 by Cook. 15 The comparison deals with morphological and ecological features 

 of the two genera, as exhibited under cultivation in eastern Guatemala. 



Greenman 16 has described a new species of Senecio (5. Hollickii), collected 

 by Britton and Hollick in Jamaica in 1908. 



Grove 17 has described, along with other new fungi, a new genus (Diploo- 

 spora) of Ascomycetes. 



Orton 18 has monographed the North American species of Allodiis, a genus 

 of Uredinales whose most conspicuous feature is the frequent close association 

 of aecia and telia on the same plant parts, and the absence of distinct uredinia. 

 The most interesting fact in connection with its host relationships is that no 

 host occurs among the Rosales. There are 47 species recognized, including 

 4 new species and 20 new combinations. 



Sprague and Hutchixsox, 19 in connection with a report upon a collection 

 of African Anonaceae, call attention to the great increase in our knowledge of 



12 Tupper, W. W., and Bailey, I. W., The secondary xylems of gymnosperms and 

 angiosperms. Science 43:323. 1916. 



13 Pritchard, R. P., and Bailey, I. W., The significance of certain variations in 



anatomical structure of wood. Forest Quart. 14:662-670. 1916. 



flowering 



Contr. 



609-6 



15 Jour. Wash. Acad. Sci. 5:288. pis. 46-50, 52, 54. 1915. 



Greenm 



Ann. Mo. Bot. Gard. 3:201, 



202. 1916 



** Grove, \Y. B., New or noteworthy fungi. V. Jour. Botany 54:217-223. 1916. 

 18 Orton, C. R., North American species of Allodus, ^Mem. N.Y. Bot. Gard. 



6:173-208. 1916. 



x » Sprague, T. A., an 

 pp. 145-161. figs. j. 19 16. 



Kew Bull. no. 6. 



