102 TITE JOL^RXAL OF BOTAXT 



Pltccinia borealis Juel. 



The secidial stage of this fungus was discovered by Greville on 

 Ben Voirlich (Loch Lomond) in 1821, and this appears to be the 

 only record of this species in Britain. It has recently been found in 

 considerable quantity on Ben Lui (Perthshire) occurring on Thalic- 

 frivn alpinum at an altitude of about 2500 ft. The aecidia are found 

 on the petioles, peduncles, and on the under surface of the leaves on 

 unthickened spots which are pale or reddish yellow on the upper 

 surface. About 8-12 secidia are found in each group. The spores 

 are rather larger than those described by Juel (K. Vet. Akad. Forh. 

 no. 8, 411, 1898), being 20-23 x 17-20 ^. 



Juel showed by infection-experiments that the uredospore and 

 teleutospore stages occurred on Agj'ostis horealis. He considered 

 that Anthoxantliuin odoratum also acted as a second host, but was 

 unable to infect this species with the aecidiospores from Tlialictrum 

 alpinum. Athough A. odoratum occurs commonly on Ben Lui, no 

 plants were present in close proximity to the diseased Tlialictrum 

 alpinum. It is proposed to carry out infection-experiments to deter- 

 mine whether this species really acts as a second host in this cointry. 



Pltccinia Polygoni-tiyipari Karst. 



This was found on 'Polygonum viviporum near Ballinling, Perth- 

 shire, in August 1915. In this neighbourhood P. viviparum is 

 found almost down to the level of the river Tay, and the fungus 

 occurs in abundance on the underside of the leaves, producing pale 

 spots on the upper surface. This rust has been recorded by Greville 

 in 1822 from Mar Lodge and by Trail in 1882 from Braemar, both 

 localities in Aberdeen. The present specimens agree with the descrip- 

 tion given by Grove, except that the uredospores are slightly larger, 

 being 22-28x20-24^. 



The uredospore and teleutospore stages of Puccinia septentrio- 

 7ialis are also found on Polygonum viviparum, but this species 

 appears to be confined to higher altitudes where its alternative host, 

 Thalictrum alpinum^ is abundant. The sori of the two species 

 closely resemble each other, but P. septentrionalis is distinguished 

 by the presence of an apical papilla on the teleutospore, while the 

 teleutospore wall of P. Polygoni-vivipari is unthickened. 



P. Polygoni-vivipari appears to be autcecious and secidia are 

 unknown. The infected plants were growing amongst grass, and an 

 examination of the withered leaves of the previous year showed 

 evidence of their infection by the fungus. No aecidia were found on 

 other species of plants in the close vicinity. 



Uromyces Oxobrychidis Lev. 

 This was found on Oct. 1914 near Faversham, Kent, growing on 

 cultivated sainfoin. It has not been previously recorded for Britain, 

 and in this case was possibly introduced with seed. The uredospore 

 sori are easily seen on the leaflets, but televitospore sori were only 

 found on the lower pait of the petioles. 



