AURICULARIALES 



545 



While the younger probasidia continue developing, the older ones 

 germinate to basidia which remain enucleate for a long time (Fig. 364, 

 5 and 6, B). When they have reached approximately three-fourths of 

 their final length, the diploid nucleus migrates into them and divides nor- 

 mally into four daughter nuclei which slip out into the basidiospores. 

 In /. Hookeriarum, the sterigmata are of unequal length and elevate the 



Fig. 364. — Iola javanetisis. 1 to 6. Development of probasidia. 7. Spherical fructi- 

 fication, Sp, on sporogonium of moss (natural size). Iola Hookeriarum. 3. Irregular 

 fructification of diplont of moss (natural size). Cystobasidium Lasioboli. 9,10. Germina- 

 tion of selerobasidia, Sc. Saccoblastia ovispora. 11, 12. Development of basidia. 13. 

 Germination of basidiospores. ( X 150; after Giiumann, 1922; Lagerheim, 1898; and Moller, 

 1895.) 



spores above the hymenium, while in I. javensis the basidium projects 

 above the gel which only extends to the tops of the probasidia. The 

 basidiospore germinates with a uninucleate secondary spore; further 

 stages of germination and the genesis of the dicaryon are unknown. 

 Perhaps the probasidia, filled with reserve material for the formation 

 of basidia, have an ecological function as well as their biological function 



