Diplolepis rosae

Diplolepis bicolor

Diplolepis ignota

Diplolepis variabilis

Diplolepis tuberculosa

Gall (Plate XLIII, Figs. 5, 6). -- Polythalamous. Composed of an agglomeration of hard cells around a branch, and it is densely covered with long, green filaments forming a moss-like mass. It measures from 25 to about 50 mm. in diameter. Occurs on the twigs of sweet briar (Rosa rubiginosa and Rosa blanda).
Habitat: Europe; Western Asia; Canada; Massachusetts; Rhode Island; (New England States); New York; New Jersey; Pennsylvania; Washington, D.C.; (Middle States); Kansas; Colorado.

Rhodites bicolor (Harr.)

Gall (Plate XLIII, Figs. 1-4) -Monothalamous. Spherical, covered with many prickly spines as long or longer, or shorter, than the diameter of the gall. Internally it is hollow with the wall about 1 to 2 mm. thick, but in specimens infested by guest-flies, it is almost entirely pithy inside. Yellowish green, sometimes tinged with red. Soft and fleshy in summer, woody and brown in winter. It is found singly or in clusters of from two to ten or more upon twigs of different kinds of wild roses (Rosa carolina, R. blanda, R. humilis, R. pisocarpa? and probably other species. It measures from 5 to 12 mm. in diameter.

Rhodites ignotus O. S.

Gall (Plate XLIII, Figs. 7-10). -Monothalamous. Very variable in shape and size. Spherical, irregularly rounded, reniform, single or more less confluent or two or three entirely coalesce thus forming an elongated mass of irregular shape. Clay brown, covered with a white farinaceous powder. Hard, woody, containing a rather large larval cell in the single gall and two or more cells in the coalescent ones. They are formed on the terminal twigs, leaves, or leaf-stalks, and as a rule are found in a cluster of from two to twenty. Measures from 4 to 15 mm. in diameter. On wild rose (Rosa blanda, R. nitida and R carolina).

Rhodites variabilis Bass.

Gall (Plate XLVI, Figs. 5-9). --Monothalamous. Variable in size and shape. Spherical, irregularly rounded, somewhat ovate or reniform, though coalescence of two or more galls. Russet brown sometime tinged with red. Internally they are pith-like with a large larval cell in the center. In the larger galls where two are more are confluent there are several larval cells. The galls occur usually in a cluster of from two to ten on the small terminal twigs, or are attached to the leaf stems while others grow on fully developed leaves of a wild rose (Rosa sp.).

Rhodites vernus O. S.

Gall (Plate XLIV, Fig. 1). -Polythalamous. Oblong or rounded swellings on small branches. Sometimes there is a series of three or more swellings attached to each other. Reddish, hard and woody, with several cells inside. Length about 1/2 inch. On the stem of wild rose (Rosa blanda).

The North American Species of Rhodites and their galls.