326 SUMMARY OF CURRENT RESEARCHES REiATING TO 



forming a white coating over Faligo septica. Tlie vegetative and 

 reproductive characters of the fungus are described and figured, and a 

 comparison is made with another species, S. penicillata, described bj 

 Von Hohnel as a parasite on another Myxomycete, Arcyria pwiicea^ 

 and with S. perpusiUa Speg., which was found on Hemiarcyria 

 calyculata. Moreau states the differences which he considers are 

 specific ; the new species is called Spicaria FuJiyonis. 



Uredineae. — W. A. McCubbin* has instituted an enquiry as to the 

 over-wintering of Gronartiwn rihicola on currant-bushes. The fficidium, 

 or Peridermium stage, occurs on white pines, and as the disease reappeared 

 in localities where infection from pines seemed impossible, it was 

 concluded that there must be over-wintering of the rust mycelium in the 

 currant. The author does not consider that the evidence to hand has 

 entirely established the fact of over-wintering. The infection really 

 depends on the distance to which the aecidiospores could be carried by 

 the wind ; " if only for a mile or two, their wintering on the currant has 

 almost certainly taken place in the area under consideration." More 

 knowledge is desired on spore dispersal. 



An account is also published of Cronartium Gompfonise, the 

 nredospores of which grow on Comptonia asplenifolia and Myrica Oale, 

 while the fecidiospores are borne on species of Finns. Perley Spauldingf 

 gives a list of other species of Myrica which he inoculated with 

 aecidiospores from the pine, but failed to secure any infection. The 

 Uredine has proved disastrous to several pines, more especially to Pinus 

 ponderosa and P. contorta. 



Gr. G. Hedgcock and W. H. Loug| have produced the secidia 

 of Feridermium carneum on young trees of Finns heterophylla by 

 inoculating them with teleutospores of Goleosporium elephantopodis. They 

 further proved that Vernoma was a second host for the Goleosporium. 

 The peridermium stage has been found on the leaves of a number of 

 pine species. 



G. Gr. Hedgcock and N. Rex Hunt§ have also proved the connexion 

 between Goleosporium on species of Ipomsea and Pharhitis and a 

 Feridermium on the leaves of Pinus echinata, P. palustris, and others. 

 A large number of allied plants were inoculated with negative results. 

 The same writers established the relationship between Peridermium 

 terehinthaceiim (on Pinus echinata, P. rigida, and P. iaeda), and the 

 Goleosporium teleutospores on plants of Silphium and Parthenium ; other 

 plants, Amsonia, Goreopsis, and Laciniaria, were inoculated without 

 results. They have found the aecidial form of Goleosporium Heliaiithi on 

 Pinus virginiana ; the teleutospore, or Goleosporium stage, was 

 determined in a large number of Helianihus species. New Peridermium 

 hosts have been established for Goleosporium Solidaginis ; there are 

 Finns species such as P. caribaea, P. contorta, P. divaricata, etc., 



* Phytopathology, vii. (1917) pp. 17-31, 

 t Phytopathology, vii. (1917) pp. 49-51. 

 X Phytopathology, vii. (1917) pp. 66-7. 

 § Phytopathology, vii. (1917) pp. 67-9. 



