Pflanzenkrankheiten. — Pteridophyten. 333 



end rot; lenticel and eye infections are seldom found in connection 

 with the jelly-end rot of the Burbank group. At flrst it was thought 

 that these rots were to distinct diseases; inoculations in 1915 left 

 no doubt in the writer's mind that F. radicicola was capable of 

 causing both types of rot. The fungus is apparently widely distri- 

 buted on partly decayed tubers and roots of plants. (The writer 

 isolated it from the roots of Popnliis deltoides, where he found it 

 associated with crownrot). The disease appears at it worst under 

 dry-land-farming conditions and in raw desert land; this faet sug- 

 gests that F. radicicola may be well distributed throughout the 

 desert soils. The disease in one of great economic importance but 

 variing greatly from year to 3^ear; the year 1914 might be called an 

 epidemic one. In that year a freeze oecurred in June which killed 

 the vines to the ground, the plant coming up anew and producing 

 a crop; often the origin of infection could be traced from the frozen 

 tip of the vine down through the stem to the infected tubers. The 

 prineipal conclusions of the writers experimental work (experiments 

 in the field, laboratory and storage experiments) are: F. radicicola 

 is capable of causing a jelly-end rot of potatoes of the Burbank 

 group and a black rot of potatoes of the round type. Neither black- 

 rot nor jelly-end rot makes any progress in storage at or below a 

 temperature of 50° F. Seed infected with blackrot will produce in- 

 fection in the resulting produet. Blackrot may be controlled fairly 

 well by planting potatoes only on lands which have been in culti- 

 vation for a number of years and b} r giving the growing crop the 

 proper amount of water, care and attention. 



Van der Lek (Wageningen). 



Weir, J. R. and E. E. Hubert. A serious disease in forest 

 nurseries caused by Peridermium filamentosum. (Journ. 

 Agric. Research. V. p. 781—785. 1916.) 



Peridermium filamentosum Peck has been found to cause a 

 serious disease of yellow-pine seedlings (Pinus ponderosa Laws). 

 The various forms of Peridermium oecurring an lodgepole pine 

 (Pinus murrayana „Oreg. Con ") the trunk form, known locally as 

 the „hipeajiker" and the branch gall form in the Rocky Mountain 

 region, with the exception of the folicolous species, have been 

 demonstrated to be Peridermium filamentosum , having an alternate 

 stage on species of Castilleja. The fact that the same species of 

 Peridermium attacks both the lodge-pole pine and the yellow pine 

 increases the difficulty of control of this fungus. The seedlings in 

 the nursery beds are being sprayed during the infection period. An 

 effort is being made to eradicate the alternate host from the vici- 

 nity b3^ mechanical or chemical means. The felling and burning 

 of trees near by infected with Peridermium will reduce the changes 

 of infection. Van der Lek (Wageningen). 



Copeland, E. B., The genus Loxogramme. (Philipp. Journ. Science. 

 C. Botany. XI. 1. p. 43 --48. PI. 1-4. 1916.) 



This paper contains an historical review of the genus, some 

 additional notes to the description and a key to the species. Most 

 of the species are illustrated on the plates. Three new species are 

 described. L. linearis (Formosa), between L. parallela and L. Fau- 

 riei, and more like the former, from which it differs in being larger 

 throughout and in the less caudate but broader paleae. L. africana 



