138 Transactions British Mycological Society. 



The teleutospores are variable in form, clavate, rounded or 

 truncate above where the wall is thickened, slightly constricted 

 and usually attenuated but occasionally rounded below, some- 

 times curved and sometimes with the pedicel attached rather 

 laterally, 44-48 x 17-23 /x, mean 45 x 21 /x ; mesospores are very 

 few 33 X 24 /x; paraphyses few or none. 



The question arises as to whether this form should be assigned 

 to P. Hordei Fuckel {Symb. Myc, Nachtr. 11, 1873, p. 16). Fuckel 

 states that P. Hordei is distinguished from P. straminis ( = P. 

 glumarum) by the minute sori, globose, rarely oval, uredospores 

 which are smooth and by the form of the teleutospores; in the 

 latter the upper cell is "more obscure," the lower cell which is 

 about equal to the upper in size is never elongated and possesses 

 a rounded base ; the pedicel is attached laterally. 



In the present specimens the uredospores are distinctly verru- 

 cose and oval in form, the upper cell of the teleutospore is 

 usually the larger and the lower cell is generally attenuated; the 

 base of the latter is usually not rounded. In these respects 

 therefore they differ from P. Hordei. The points of resemblance 

 are the small sori and the presence of a few teleutospores with 

 rounded base and lateral pedicel. 



Sydow {Monogr. Ured., i, p. 708) and Eriksson and Hennings 

 [Getr eider oste, p. 238) merge P. Hordei in P. glumarum and this 

 is followed in the case of the present specimens. The almost 

 complete absence of mesospores distinguishes the specimens 

 from P. simplex Erikss. et Henn. 



The relationships of this rust must remain doubtful until its 

 powers of infection are known and infection experiments are 

 now being commenced. No such work appears to have been 

 carried out with P. Hordei. 



P. Anthoxanthi Fckl. 



Uredospores and teleutospores on Anthoxanthum odoratum L. 

 near Aberdeen, Oct. 192 1. 



It was suggested in a previous note [Journ. Bot. 1915, p. 47) 

 that two distinct rusts had been confused under the above 

 name in this country, and this has now been shown to be the 

 case. 



P. Anthoxanthi Fckl. appears to be of rare occurrence, and 

 has not been previously recorded in Scotland although recently 

 recorded from Wales by Grove {Journ. Bot. 192 1, p. 311). In the 

 Scottish specimens the uredospore sori attain a length of 6mm. 

 and are produced so abundantly as to give the whole leaf a 

 rusty appearance; they are also found on the leaf sheaths and 

 stems. The uredospores measure 20-25 x 17-20 /x and possess 

 2-3 equatorial germ-pores ; no paraphyses are present in the sorus. 



