294 THE MICROSCOPE. 



represents a vertical section of a leaf of black-currant, in- 

 fested with JScidium grossularice ; its spermogonia are 

 seen on the surface, and the perithecia below. The family 

 Sphce?*iacei (No. 3, Plate I.), common enough on most 

 herbaceous stems, first seem to be little black spots, a ; 

 when examined more closely are found to resemble little 

 brownish bottles, 6, filled with rolls of spores. Other in- 

 structive specimens are — 



Gystopus candidus (Uredo olim), Crucifer White-rust; 

 conidia equal, globose ; membrane equal, ochraceous ; 

 oospores sub-globose, epispore yellowish-brown, with irre- 

 gular obtuse warts : warts solid. On shepherd's purse, 

 cabbage, and other Cruciferae : receptacle consisting of 

 thick branched threads ; conidia concatenate, at length 

 separating ; oospores deeply seated on the mycelium. — 

 Phyllactinia guttata (Olim Erysiphe). Plate I. No. 9. 

 Hazel Blight ; amphigenous ; mycelium web-like, often 

 evanescent ; conceptacles large, scattered, hemispherical, 

 at length depressed; appendages hyaline, rigid, simple; 

 sporangia 4-20, containing 2-4 spores. On leaves of haw- 

 thorn, hazel, ash, elm, &c. — Aregma (Phragmidium) buU 

 bosum. Plate I. No. 20. Bramble Brand ; hypogynous, 

 with a dull red stain on the upper surface ; spores in 

 large tufts, 4-septate, terminal joint apiculate; peduncles 

 incrassated, and bulbous at the base. — Puccinia variabilis, 

 Variable Brand ; sori amphigenous, minute, roundish, sur- 

 rounded by the ruptured epidermis, nearly black ; spores 

 variable, obtuse, cells often subdivided ; peduncle very 

 short. On leaves of dandelion. — Puccinia buxi, Box Brand. 

 Plate I. No. 17. Sori sub-rotund, convex, and scattered; 

 spores brown, oblong, rather strongly constricted, lower 

 cell slightly attenuated ; peduncle very long. On both 

 surfaces of box leaves : spores uniseptate, supported on a 

 distinct peduncle. Plate I. No. 18. — Ti-ichobaxis (Uredo 

 olim) senecionis, Groundsel-rust ; spots obliterated ; sori 

 solitary or regularly crowded ; sub-rotund and oval, on the 

 under surface, surrounded by the ruptured epidermis; 

 spores sub-globose, orange. On various species of groundsel : 

 spores free ; attached at first to a short peduncle, which 

 at length falls away. 



It appears that at particular periods of the year the 



