OP THE UNITED STATES. 21 



Like G. miisii, the present species, although occurring in localities as remote as Massa- 

 chusetts and California, is known in only a few localities, but where it occurs it is 

 generally abundant. There can be no doubt whatever, in spite of the unusually large 

 number of cells of which the spores are composed, that the species should be placed in 

 Gymnosporangium, and the number of cells only goes to strengthen the view that Hama- 

 spora cannot be kept as a distinct genus. 



Gymnosporangium clavipes Cooke and Peck. 

 PI. 2, figs. 22-27. 



Podisoma gymnosporangium, var. clavipes C. and P., in Notes on Podisoma, 1871. 

 Gymnosporangium clavipes C. and P. in Peck's 25th Report, p. 89; Farlow, Bull. Bussey 



Inst., Vol. 11, p. 226 ; Exsicc. Ravenel's Fungi Americani Exsiccati, No. 272. 

 Podisoma Juniperi Herb. Curtis in part. 

 Gymnosporangium sp. Herb. Curtis in part. 



Sporiferous masses subpyriform or irregularly globose becoming indefinitely expanded, 

 reddish yellow when dry, orange when swollen, about a quarter of an inch high ; spores 

 broadly ovate, obtuse, two-celled, generally constricted at the septum ; pedicels broad, much 

 swollen beneath the spores, 40/^-60^ long by 22^38^ broad; promycelia usually two or 

 three from a cell, frequently produced from the apex of the cells. Mycelium perennial 

 in the leaves and branches, producing nest-like distortions. 



On Juniperus virginiana. 



Eastern Massachusetts (Farlow) ; New York (Peck) ; New Jersey (Ellis) ; Pennsylvania 

 (Michener); North Carolina (Curtis); South Carolina (Ravenel). 



One of the most unsightly species of the genus and certainly common in the Atlantic 

 States from Massachusetts to Florida. The mycelium is abundant in the leaves and 

 branches and produces peculiar distortions already referred to under G. macropus. The 

 leaves swell to double their original size and become sharp pointed and rather spreading. 

 The effect produced will be seen by comparing figs. 22 and 23 of Plate 2, where fig. 23 

 shows a twig with normal leaves, and 22 one attacked by G. clavipes. The branches 

 are somewhat swollen and the branching of the affected ones becomes very dense, so 

 that at a distance it appears as if there were bird's-nests in the boughs. The branches 

 are often distorted for a distance of a foot or a foot and a half The sporiferous masses 

 are very abundant on the leaves and branches. Those on the leaves appear at their bases 

 where they are adherent to the stems. They are at first broadly obovate, but 

 soon become either subpyriform or irregularly globose and much wrinkled, and after 

 having been exposed to a few showers they become quite amorphous, and form discol- 

 oured films on the leaves and branches. On the branches the sporiferous masses are very 

 similar to those on the leaves, but they are rather larger and more irregular in shape. 

 When young and dry, they often are reddish rather than brown, and lack the deep brown 

 color generally seen in the early stages of other species. The mycelium is apparently 

 perennial, but I am not entirely certain on that point. 



