584 Floristik, Geographie, Systematik etc. 



{P. aciuninata X Sargentii), Salix nigra nltissiyna Sarg., Quercus 

 stellata Mavgavetta Sarg., (Q. Margaretta Ashe), Q. ludoviciana Sarg. 

 {Q. pagodaefolia X Phellos), Malus glabrata Rehder, M. platycarpa 

 Rehd., M. fragans Rehd., [Pyrus coronaria Du Roi, M. coronaria 

 puhenila Rehd., M. bracteata Rehd., M. ioensis spinosa Rehd., M. 

 ioensis cveniserrata Rehd., M. ioensis Biishii Rehd., Crataegus per sistens 

 Sarg., C. peregrina Sarg., C. paUiata Sarg., C. triwnphalis Sarg., C. 

 bellica Sarg., C. uniqua Sarg., C. cerasoides .Sarg., C. monantha Sarg.. 

 C. ainicalis Sarg., C. velutina Sarg., C. enucleata Sarg., C. Keller manii 

 Sarg., C. seclusa Sarg , C. anibitiosa Sarg., C. comparata Sarg., C. 

 tinnida Sarg., C. remota Sarg., C. superata Sarg., C. rara Sarg., C. 

 Mackenserüi Sarg., C. placens Sarg., C. meticulosa Sarg., C. tentiis- 

 sitna Sarg., C. stellata Sarg., C. Shirleyensis Sarg., C. Brockwayae 

 Sarg., (C. Douglasii Wheeler), C. scabera Sarg., Prunus Pahneri 

 Sarg., P. fultonensis Sarg., Prosopis julißora con striata Sarg., [P. 

 glandulosa Cocks, printed as Cox); Acer sinuosum Rehd., A. flori- 

 danum villipes Rehd., A. Saccharuni Schneckii Rehd., Aesculus gl au- 

 cescens Sarg., A. georgiana Sarg., A. georgiana pubescens Sarg., A. 

 Harbisoni Sarg., A. glabra leucodermis Sarg., A. glabra niicrantha 

 Sarg., A. discolor niollis Sarg. {A. ntollis Raf.), A. discolor ßavescens 

 Sarg. {A. Pavia discolor Gray), and A. splendens Sarg. 



Trelease. 



Shaw, G. R., The genus Pinus. (Cambridge. Publications of the 

 Arnold Arboretum n^. 5, 1914.) 



A quarto of IV, 96, with 39 plates drawn by the author. A 

 discussion of the taxonomic value of characters including internal 

 structure, occupying a fifth of the volume, is followed by a taxo- 

 nomic analysis of 66 species with notes on geographic occurrence 

 and ecologic modifications. The Classification is based "on thegradual 

 evolution of the fruit from a cone symmetrical in form, parenchj'ma- 

 tous in tissue, indehiscent and deciduous at maturity, releasing its 

 wingless seed by disintegration - to a cone oblique in form, very 

 strong and durable in tissue, persistent on the tree, intermittenth' 

 dehiscent, releasing its winged seeds partly at matu^t^^ partly at 

 indefinite intervals during several years", — taken as the most 

 primitive and the most elaborate of coniferous fruits. Trelease. 



Stewart, A., Notes on the botany of Cocos Island. (Proc. 

 California Acad. Sei. 4 Ser. I. p. 375—402. pl. 31— 33. Jan. 1, 1912.) 



The flora of this oceanic Island is held to be of more recent 

 origin than that of the Galapagos group, with a high percentage 

 of ferns, the number of endemic species of all groups being small. 

 The list of the author's collections includes as new Cecropia Pittieri 

 Robinson. Trelease. 



Stewart, V. B., Some important leaf diseases of nurserv 

 stock. (Bulletin n«. 358. Cornell Univ. Agr. Exper. Sta. Apr. 1915.) 



Dealing with Venturia inaeqiuilis, V pyrina, Podosphaera Oxya- 

 canthae, P. leucotricha , Cocconiyces hienialis, C. pruiwpJiosae, C. lu- 

 tescens, Pseudopeziza Ribis, Septoria Ribis, Sphaerotheca morsuvne. 

 Laestadia Aesculi, Exoascus deforuians, Fabraea maculata, Mycosphae- 

 rella sentina, Diplocarpon Rosae, and Spliaerotheca paniiosa. 



Trelease. 



