L28 



IMTCINIA 



■•■ 



Concerning the difference between this species and U. Dactylidu 

 (apart from the habitat) little that is definite can 

 ^ .Vl" a be said. Some authors unite them, but I find the 



teleutospores of U. Poae to be usually more oblong 

 and often provided with shorter pedicels and the 

 sori to be less conspicuous. The leaves of Poa are 

 smaller than those of Dactylis, and the teleuto-sm-i 

 do not cover them in such enormous numbers and 

 never extend to the culms. 



Juel divides this species into 9 or 10 biological 

 races, but there is the usual conflict between 

 different experimenters as to their limits. Some 

 would even deny, what has been proved several 

 times, that an secidium on Pi. Ficaria belongs 

 here: see U. Rumicis (p. 115). This secidium 

 and U. Ficariae may occasionally be found on the 

 same leaf of R. Fia.tr in. Kig. 7!).) 



It must not be forgotten that an secidium which 

 occurs on R. bvlbosus and R. repens belongs to 

 Puccinia Magnusiana : this is morphologically in- 



b 



Fi^'. 79. .Kcidia of U. 

 Poae (b) and teleuto- 

 sori of U. Ficariae 

 (a), on a leaf of I?. 

 Ficaria, nat. size. 



distinguishable but is said to be later in its 

 appearance. The eecidia which can be seen on 

 R. repens in July and August possibly all belong 

 to this latter species. The teleutospores of U. Poae can most easily be 

 found by looking on the lower leaves of Poa in June or July, along a damp 

 road-side where It. rcpc/is is abundant. 



Distribution : Europe, Asia Minor, Nova Scotia. 



PUCCINIA Pers. 



Autcecious or hetercecious. 



Spermogones as in Uromyces. vEcidia with a peridium, which 

 is occasionally evanescent ; spores as in Uromyces. Uredospores 

 as in Uromyces. Teleutospores two-celled, rarely one- or several- 

 celled, the upper cell usually with an apical pore, less often the 

 pore is displaced to the side; the lower cells with a pore just 

 beneath the septum or rarely at a lower level. Basidiospores as 

 in Uromyces. 



