Tcleutospores. 4 1 



surmounted by a prominent conical point. The membrane 

 soon becomes dark and thickened, and each spore, en- 

 veloped by its endospore, pretty well fills each compart- 

 ment. In the mature state the entire teleutospore is 

 clothed by a colourless transparent cuticle, which is gene- 

 rally tuberculate. That this cuticle is distinct from the 

 thick membrane is shown by warming a spore in caustic 

 potash, when the former disappears, while the thick mem- 

 brane remains unaffected. 



From two to four lateral germ canals or pores occur 

 in the membrane, as Tulasne first showed (Plate IV. 

 Fig. 5). These are arranged equatorially, and appear to 

 be about four in number. Dietel,* however, remarks that 

 in PJi. obtiisujn, Strauss, the germ-pores are placed as in 

 Puccinia, namely, the superior one at the apex of the 

 upper cell, and those of the lower cells laterally immediately 

 below each of the septa, and that there is only one germ- 

 pore in each cell. A similar condition, he states, exists in 

 the Australian species Ph. barnardi, Plow\ Longitudinal 

 septation very rarely happens, f 



In Coleosporium a similar condition exists, but in Tri- 

 phragmium the divisions are multiple and longitudinal. 

 In Cronartium the tcleutospores are arranged in the form 

 of a solid pillar or column, that projects perpendicularly 

 to the spore-bed, and is surrounded at its base by a nest of 

 uredospores. In Chrysomyxa the tcleutospores occur in 

 waxy masses, and consist of a series of superimposed 

 spores, each of which has a single germ-pore placed as in 

 the lower cell of Puccinia, not equatorially, but laterally 

 near the upper end. In Gymnosporangium the spores are 

 held together by a gelatinous matrix ; they are shaped 



* Dietel, " Beitrage zur Morphol. und Biolog. der Uredineen," Botan. 

 Centralblatt . , bd. xxxii. (1887), tab. ii. figs, i and 2, reprint, p. 9. 

 t Eysenhardt, " Linnrea," vol. iii. 1828. 



