336 Pflanzenkrankheiten. 



Hedgcock, G, G., Notes on some diseases of trees in our 

 national forests. IV. (Phytopathology. IV. p. 181—188. 1914.) 



As a contiiiuation of some notes on forest tree diseases, the 

 writer publishes in the present paper his observations on the 

 following disease causing fungi. 



Herpotrichia nigra Hartig and Neopeckia coiilteri (Peck) Sacc, 

 both fungi not of great importance, but frequently occurring. The 

 fungi can not be considered as obligate parasites; the death of the 

 host is caused chiefly by the smothering effect of the dark, dense, 

 felty layers of mycelium shutting out the light and air. In addition 

 to the data, given recently by Sturgis in a paper on the occurrence 

 of these fungi in the United States, the writer publishes a many 

 on their geographical distribution. 



Fontes pinicola Fr. including F. ungulatus (Schaeff.) Sacc, F. 

 marginatus Gill. and Polyporus ponderosus Schenck is a wound- 

 parasite, entering through heartwood or sapwood, and is not at all 

 a conifer-attacking fungus, but is also found on many frondose 

 trees, of which the writer now reports a number for the first time. 



Fontes fonientarius (L.) Fries causes primarily a rot of the 

 sapwood of trees, and secondarily may attack the heartwood. It has 

 been collected not only on birches and beeches, but also on species 

 of Acer, Populus, Prunus and Quercus. 



About Fomes applanatus (Pers.) Wallr. the writer has come to 

 the conclusion, that very frequently it attacks both sapwood and 

 heartwood of many living trees. It was found to be the cause of 

 a serious root-rot of the aspen {Populus treniuloides) , especially on 

 moist slopes. In this case, it seemed not to be preceded by F. 

 igniarius. A number of other hosts is mentioned. 



Polyporus schweinitsii Fr. is the most important root rotting 

 fungus of conifers, especially for the Douglas-flr {Pseudotsuga 

 taxifolia). In some forests the number of diseased trees, estimated 

 from stumps or saw logs, was found to be 30 per cent of the total 

 cut. The rot, caused by P. s. in almost universally confined to the 

 roots and base of the trunks. 



The writer finds that Fomes roseus (Fr.) Cooke {Polyporus 

 carneus Nees) has a wide ränge of hosts, which are indicated. Two 

 forms of sporophores are described, one with thin and the other 

 with thick bracket-shaped fruits (the latter tending to become hoof- 

 shaped), widely differing in size, depending largely on the substratum 

 upon which they grow. M. J. Sirks (Haarlem). 



Hedgeock, G. G. and W. H. Long. Identity of Peridermium 

 fusi forme with Peridermium cerebrum. (Journ. Agr. Res. II. 

 p. 247-250. pl. 11. June 15, 1914.) 



Cronartium cerebrum is proposed as a new name for the oak 

 fungus constituting a stage of the aecial forms which are united. 



Trelease. 



Kiggins, B. B., Contribution to the life history and phy- 

 siology of Cyliudrosporium on stone fruits. (Amer. Journ. 

 Bot. I. 145—173. pl. 13-16. Apr. 1914.) 



Contains diagnoses of Coccomvces hiernalis Higgins, Science, 

 n. s. XXXVII. p. 637— 638. 1913 and the new sx>ec\QsC. prunopherae 

 and C. lutescens in addition to an exhaustive study of the fungi and 

 hosts. Trelease. 



