ON IMPATIENS 205 



pale-yellowish, 16 — 22x14— 20 fi, with 3—5 (usually four) 

 germ-pores. 



Teleutospores. Sori similar, but chestnut-brown; spores 

 ellipsoid to subclavate, with a colourless conical cap to each 

 germ-pore, rounded or slightly attenuated at both ends, hardly 

 constricted, smooth, pale-brownish, 25—38 x 12 — 22 /z; pedicels 

 hyaline, slender, short. 



[zEcidia on Adoxa Moschatellina, April — June;] uredo and 

 teleutospores on Impatiens fulva, I. Noli-tangere, May, August- 

 October. Very rare; Albury, Surrey, October, 1864 (Rev. L. 

 Jenyns), Guildford (Rev. W. A. Vize), Shere (M. C. Cooke), 

 Kew Gardens (G. Massee). (Fig. 152.) 



The teleutospores are at first produced in the same sori as the uredo- 

 spores ; the eecidial stage is not recorded, probably because it has been 

 confounded with the secidium of P. albescens, from which it is distinguished, 

 according to Bubak, by its gold-coloured spores. I do not think this 

 distinction will hold good ; many of the specimens found in this country, 

 which appear to be P. albescens, have golden-yellow spores. See under 

 that species (p. 163). 



The description given above of the spermogones and secidia is taken 

 from Bubak, who showed (Centralbl. fiir Bakt. 2. xii. 413) that they could 

 produce the other stages on Impatiens in about ten days. He also showed 

 that the secidium could be produced on the Adoxa by over-wintered 

 teleutospores ; the incubation period was as long as one month, probably 

 because the mycelium first permeated the whole plant, from the leaf to 

 the stem, before producing spores. Afterwards he proved, contrary to his 

 former opinion, that the mycelium does not perennate in the rhizome, but 

 fresh infection must take place each spring {ibid. xvi. 150). 



Distribution : Central and Northern Europe, North 

 America, Japan. 



77. Puccinia Buxi DC. 



Puccinia Buxi DC. Flor. ft', vi. 60. Cooke, Handb. p. 508 ; Micr. 

 Fung. p. 212. Plowr. Ured. p. 217. Sacc. Syll. vii. 688. Sydow, 

 Monogr. i. 453. Fischer, Ured. Schweiz, p. 316, f. 228—30. 



Teleutospores. Sori amphigenous, on indefinite spots, scat- 

 tered or confluent, hemispherical, pulvinate, hard, compact, 

 soon naked, dark chestnut-brown or purplish-brown ; spores 



