Observations on some Scottish Uredineae and Ustilagineae 141 



The orange-yellow uredospores show up conspicuously on t±ie 

 bright green leaves, especially after the son dehisce and the 

 spores are shed. The latter are produced in great abundance and 

 fall to the groiuid in powdery masses. 



Infected plants were gro\%Ti for several months in Edinburgh 

 and continued to form numerous uredospores but no teleuto- 

 spores were produced. Healthy plants of Epilohium aipinum 

 were readilv infected by placing uredospores on their leaves but 

 all attempts to infect E. angustifolium L., E. ohsciiriim Schreb., 

 E. viontanum L., and E. alsinefolium Vill., resulted in failiure. 

 It appears therefore that we are here dealing with a specialised 

 form which is restricted to E. aipinum as host and the name 

 P. Epilohii sp. f. alpinae is accordingly suggested. The absence 

 of spots on the leaves of the host and the fact that the measure- 

 ments of the uredospores are sUghtly greater than those given 

 bv Svdow {Monog. Ured. ill, p. 444) are not considered to be 

 characters of sufficient importance to justify the creation of a 

 new species. 



P. Epilohii is recorded on Epilobiiitn aipinum by Sydow [I.e.). 



It is also found on E. alsinefolium, E. monfanum and a number 

 of other species. It is included under P. pustulatum Diet, by 

 Grove [Brit. Rust Fungi, p. 366). Sydow (/. c. p. 443) di\-ides 

 the latter species into: (i) P. Ahidi-Chamaenerii Kleb. on 

 E. angustifolium and other species of the section Chamaenerion 

 which produces nimierous teleutospores in obvious sori and has 

 its aecidium on Ahies halsamea and .4. pectinata, (2) P. Epilohii 

 Otth. on various species of the section Lysimachion with few 

 teleutospores in inconspicuous sori and no known aecidial stage. 



Xo species of Pucciniastrum appears to have been pre\iously 

 recorded on E. aipinum in Britain. 

 Thecopsora vacciniorum Karst. 



Uredospores on Vaccinium Myrtillus L. near Aberdeen, and 

 BaUinluig. Perthshire, Oct. 1921 and on Vaccinium uliginosum L. 

 Ben Lui ."Perthshire, Sept. 192 1. 



The uredospore stage appears to be widespread in Scotland 

 on Vaccinium Myrtillus. Infected leaves of T'. uliginosum were 

 kept during the winter on damp soil but did not develop the 

 teleutospores. The fungus has been pre\-iously recorded on 

 T'. Myrtillus, V. uliginosum and on T'. Vitis-Idaea in Scotland 

 by Trail (" Re\-ision of Uredineae and Ustilagineae of Scotland," 

 Scot. Nat. 1890). 



COLEOSPORIUM SeNECIONIS Ff. 



Uredospores and teleutospores on Senecio Smithii DC. Col- 

 lected bv Mr S\Tnington Grieve on the island of Coll, Arg3'llshire, 

 July 1922. 



