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THE BOTANICAL MAGAZINE. [Vol. xxix. No. we. 



in the case of the native subalpine habitat. To induce the ger- 

 mination of the teleutospores, a few leaves were placed on that 

 day in a Petri-dish containing sterilized wetted sand ; and at 

 the same time a Rhododendron pot, which had been thoroughly 

 sprayed, was placed under a bell-glass. 



On the following day, sporidia began to be formed on some 

 sori. On that day and on the 24th, the young leaves of a 

 small potted Picea ajanensis were infected with the sporidia. 

 Bell glasses were taken off after two days. 



On June 1, we noticed a slight yellow discoloration on the 

 leaves of the spruce. On June 5, spermogonia were observed 

 on the undersurface of the leaf. We noticed honey-colored exu- 

 dation from some of them. 



On June 24, we observed that the aecidia had grown conspi- 

 cuously, some of them attaining the length of nearly 1.3 mm 

 and some onh r 0.5 mm. A greater part of them took the tubu- 

 lar form, while the rest of them the elongated sack-like forms 

 of various sizes. 



The above mentioned experiments as well as the field ob- 

 servations at Ochiai have proved bej-ond all doubt, that Peri- 

 dermium Picese-hondoensis Diet. (6) on Piceaa janensis is the 

 Aecidium stage of Chrysomyxa expansa Diet. (5) on Rhodo- 

 dendron brachycarpum. It would be extremely interesting, if 

 Chrysomyxa himalensis Barce. (1), which is parasitic on Rh. 

 arhoreum, a member of the Eurhododendron, and which has 

 also young mushroom-like sori, should happen to form also its 

 Aecidium stage on some species of Picea belonging to the Sec- 

 tion Omorica, as for instance Piceas pinulosa Griff. (3, p. 287). 

 The author wishes to express here his sincere thanks to 

 Prof. S. Kusaxo for his extreme kindness in sending him a part 

 of the type specimens of the fungi under consideration. He 

 wishes also to acknowledge his indebtedness to Messrs. Saito, 

 Arita, Hiratsuka and other gentlemen who favored him with 

 valuable specimens, which were the incentive to the prosecution 

 of the present work. 



