36 I PUCCINI \sti:i'M 



w Is where Abies and Symphytum both grew together. Tins was the 



experience of Bubak see Ber. Deutsch. Bot. Gesell. L903, xxi. 356). The 

 itospores appear to arise or at least to mature about May on a 

 perennial mycelium from the previous year, and are capable' of immediate 

 germination: their basidiospores infect the young Fir-needles, but the 

 mycelium thus produced is not perennial ami causes no witches'-brooms. 

 The secidiospores are distinguished from those of the other species which 

 grow upon the same host by their much larger size. The whole of the 

 foregoing particulars (excepl as regards the uredospores are due to Bul>;ik 

 ami Fischer; the former found his uredospores chiefly upon Symphytum 

 tuberosum. 



It will lie useful to tabulate here by what characters the various secidia 

 on Abies pectinata can lie discriminated : that belonging to 



.)/■ /"uipsorella Cajy<i/J,t///</r, ,/,•»,, * causes witches'-brooms. 



.1/ sella S>imphi/ti has large spores 20 — 40x18 — 29 /z. 



Puceiniastrum pustulatum has a smooth line down the spore. 



Calyptospora Goeppertiana has spores 21 — 30 x 14 — 18 p. 



Distribution : Europe. 



PUCCINIASTRUM Otth. 



HeteiXHcinus or recidia unknown. 



Teleutospores extracellular, in a single layer, subepidermal, 

 with a brownish membrane, divided by vertical septa into 

 2 — 4 cells. Uredo-sori surrounded by a delicate hemispherical 

 peridium, opening at the summit with a pore; uredospores 

 yellow in mass, with indistinct or no germ-pores. 



^Ecidia with a thin cylindrical peridium (so far as known) ; 

 aecidiospores verrucose except on one side which is thinner and 

 smooth (? always), not provided with germ-pores. 



1. Puceiniastrum Agrimoniae Tranzschel. 



Uredo Potentillarum var. Agrimoniae DC. Flor. fr. vi. 81. 

 U. Agrimoniae Plowr. Ured. p. 255. Sacc. Syll. vii. 839. 

 Coleosporium ochraceum Fckl. ; Cooke, Micr. Fung. p. 218. 

 Puceiniastrum Agrimoniae Tranz. Script. Bot. Hort. Petrop. iv. 301. 

 Fischer, Ured. Schweiz, p. 465. Arthur, N. Arner. Fl. vii. 106. 



Uredospores. Sori chiefly hypophyllous, pulvinate, small, 

 confluent, sometimes spread over the whole leaf, covered by the 

 epidermis and surrounded by a thin peridium which opens at 

 the summit with a pore, orange-yellow, fading to ochraceous ; 



