Fig. 150.—Phragmidium gracile: a an uredospore; b and c two paraphyses; d a young teleutospore; e a teleutospore with a basidium and two basidiospores (s); f two series of æcidiospores (Ph. rosæ).
Calyptospora gœppertiana; teleutospores on Vaccinium vitis idæa; spermogonia and æcidia on Abies alba (Firneedle-Rust).
Coleosporium (Fig. [155]) forms its uredospores in reddish-yellow chains; for the teleutospores, see page [147]. C. senecionis, on the Groundsel; its æcidium (Peridermium wolffii) on Pine-leaves (Fig. [155] a). Other species on Sonchus, Petasites, Campanula, Rhinanthaceæ.
Chrysomyxa (Fig. [156]) has bright red, branched teleutospore-chains; each spore developes a 4-celled basidium. C. ledi, on Ledum palustre; its æcidia on the leaves of the Fir. C. abietis (Fig. [156]), without uredo-and æcidiospores; teleutospores on the leaves of the Fir. In the first summer, yellow bands are formed on the leaves, and in the following spring the red cushions of spores.
Fig. 151.—Melampsora padi: a and b uredospores; c-f teleutospores, seen from different sides.
Fig. 152.—Pear-leaf, seen from the under side, with “Rœstelia cancellata”: in different ages (a youngest, d oldest).
Fig. 153.—Melampsora betulina: a uredospores; b three contiguous teleutospores, one of which has developed a basidium with three basidiospores. (× 400.)