632 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Periderminm from Pennsylvania, Notes on. By C. R. Orton 

 and J. F. Adams (Phytopathology, iv. p. 23 ; February 1914 ; plate). — 

 The rust of certain pines, which has Comptonia peregrina (Sweet Fern) 

 as its alternate host, has been thought to be Peridermium pyriforme, 

 but the authors show it is not that species and propose the name 

 P. Comptoniae for it. It attacks Pinus austriaca, P. echinata, P. 

 maritima, P. montana, P. ponderosa, P. rigida, P. sylvestris, P. Taeda, 

 and P. virginiana. 



Cfonartium Comandrae attacking Comandra umbellata is thought 

 to be connected with Peridermium pyriforme, which attacks Pinus 

 rigida, P. pungens, and P. contorta. — F. J. C. 



Phylloxera Resistant Stock, Grafting. By D. Jenkins {Agr. 

 Gaz. N.S.W. vol. xxv. pp. 689-692 ; 20 figs.). — The cuttings for grafting 

 are nine inches long, and not less than J inch at the narrow end. They 

 are buried in sand until required. Before use all the buds are removed 

 and the cuttings are washed. The scions are similarly prepared, but 

 one eye is left. The method of grafting is illustrated by numerous 

 cuts.~S. E. W. 



Physalospora Cydoniae. By L. R. Hesler {Phytopathology, iii. 

 pp. 290-295 ; December 1913 ; figs.). — The author is led to conclude, 

 as the result of cultural and inoculation experiments, that the mature 

 form of Sphaeropsis Malorum, the organism of apple black-rot, is 

 identical with Physalospora Cydoniae Arnaud. — F. J. C. 



Pine, Morth American Species of. By J. C. Arthur and F. D. 

 Kern {Mycologia, vi. p. 109 ; May 1914). — A review of the species 

 of the genus Peridermium which causes blister-rusts on various pines 

 and have as alternate hosts various small shrubs and herbaceous 

 plants. — F. /. C. 



Pine Rust, The Introduction of a European, into Wisconsin. 



By J. J. Davis (Phytopathology, iii. pp. 306-307 ; December 1913). 

 — Announces the discovery, and suggests the probable mode of intro- 

 duction to America, of the rust fungus so common on sow thistles 

 in this country — Coleosporium Sonchi-arvensis — which in the spring 

 attacks the foUage of Scots fir. — F. J. C. 



Pinus, Spur Shoot of. By Robert Boyd Thomson (Bot. Gaz. 

 Ivii. pp. 362-385, May 1914 ; 4 plates and 2 figs.). — The author con- 

 siders that ancestrally the leaves of the pines were spirally arranged 

 on ordinary branches. The spur has been derived from this condition, 

 as is shown by : — 



1. The indefinite number of leaves in a fascicle (of this numerous 

 examples are quoted). 



2. Supernumerary needles occur in the recognized primitive 

 region and after wounding. 



