L46 



PUCCINIA 



these latter that new infections arise in the spring as 30011 as the shoots 

 appear. The hibernation of the mycelium in the rhizome, which is si 

 by Plowright, lias oot been proved. 



The LriTiu-pures arc very easj to see in the uredospores of this - ] .< •< 1 . - 

 ami its allies. Each is often surrounded by a border like a bordered pit, 

 an appearance caused by a thickening of tin- membrane around and over 

 the pit. As visual the appearance of the spore changes according a- it is 

 wet or dry ; if wet, it may appear merely punctate; if dry. it is seen to be 

 densely ami coarsely echinulate. 



Distribution": Northern and Central Europe. Siberia, 

 North America. 



20. Puccinia Andersoni B. et Br. 



Puccinia Andersoni B. et Br. Ann. Xat. Hist, ser. 4, xv. 35. Cooke, 

 Micr. Fung. p. 206; Grevillea, iii. 179. Plowr. Cred. p. 204. 

 Sacc. Syll. vii. 710. Sydow, Monogr. i. 58. 



Teleutospores. Sori hypophyllous, seated on round yellow 



spots 1 — 1^ cm..diam. with a brown 

 border, almost concealed by the 

 pubescence of the leaf, minute, but 

 densely crowded in flat circular 

 clusters which are few on each leaf, 

 compact, blackish-brown or purplish- 

 black: spores oblong to clavate, 

 rounded or conically thickened (8 — 

 10 /la) above, slightly constricted, 

 smooth, pale-brown, 40 — 54 x 16 — 

 22 /x ; pedicels browTiish, stout, per- 

 sistent, as long as the spore or 

 longer; a number of mesospores 

 are found intermixed. 



Fig. 98. P. Andersoni. Teleu 

 tospores and mesospore. 



On Cirsium hetero'phyllum. June — October. A striking 

 and rare species. Glen Ogle (Rev. M. Anderson). Den of 

 Airlie (Mr Gardiner), Ingleton and Grassington, Yorkshire 

 (H. T. Soppitt), Alston, Cumberland (J. G. Baker). (Fig. 98.) 



DISTRIBUTION : in a few places in Europe. 



