ON (iHAMIXE.K 



269 



I have found that in many cases only one cluster is formed (or at 

 most two small ones) on a leaf; this probably indicates a scarcity of 

 active basidiospores. In other localities, however, eight or ten clusters 

 in a v be found on a single leaf. This secidium must not lie confounded 

 with Caeoma Alliorum, which belongs to the Melampsoroe. 



(4) Puccinia Phalaridis Plowr. 



Mcidiwrn Ari Desm. < 'at. Plant, omis. p. 26. Cooke, Handb. p. 5 15 ; 



Micr. Fung. p. 199. 

 Puccinia Phalaridis Plowr. Journ. Linn. Soc. 1888, xxxiv. 88; Ured. 



p. 166. Sydow, Monogr. i. 783. 

 /'. Ari- Phalaridis Kleb. in Pringsh. Jahrb. 1899, p. 399. Fischer, 



Ured. Schweiz, p. 344, f. 252. 



Spsrmogones. Epiphyllous or a few Irypophyllous, dark 

 honey-coloured, in roundish groups. 



/Ecidiospores. ^Ecidia hypophyllous, in roundish clusters 

 (often surrounding a little group of 

 spermogones), on conspicuous pale- 

 yellow spots, cup-shaped, with a broad 

 cut white revoluto margin ; spores deli- 

 cately verruculose, yellow, 15 — 2G /x. 



iEcidia on Aram maculatum. Not 

 common. May — July. (Fig. 205.) 



The same remark may be made about the 

 occurrence of this as about the preceding form. 

 The three latter races are biologically quite dis- 

 tinct in so far that, in experimental cultures, 

 each of them will produce the secidium only 

 on that particular genus to which it has 

 become accustomed. This has been abun- 

 dantly proved by Plowright, Klebahn, Fischer, 



Dietel and others. But the groups of secidia are exactly of the same type 

 in each case, and must have had a common origin in the past. 



Fig. 205. P. Phalaridis. 

 ^Eeidia on Arum 



maculatum. x h- 



124. Puccinia Anthoxanthi Fckl. 



Puccinia Anthoxanthi Fckl. Symb. Myc. Nachtr. ii. 15. Plowr. Ured. 

 p. 194. Sacc. Syll. \ ii. 665. Sydow, Monogr. i. 727. Fischer, 

 Ured. Schweiz, p. 261. McAlpine, Rusts of Australia, p. 115, 



f. 20—1. 



