Taphrina pruni Taphrina pruni Taphrina pruni is a fungal plant pathogen of blackthorn (Prunus spinosa) that causes the Pocket or bladder Plum gall, a chemically induced distortion of the fruit (sloes), producing swollen on one side, otherwise deformed and flattened fruit gall without a stone. The twigs on infected plants may also be deformed with small strap-shaped leaves. "T. pruni" produces a distinctive tongue-like growth, similar to other closely related species such as "Taphrina alni" on Alder ("Alnus glutinosa") and "Taphrina padi" on Bird Cherry "Prunus padus". The growth is the distorted fruit and not a fungus in its entirety. "T. pruni"
Prunus alleghaniensis bark is fissured in older specimens. The flowers are plentiful and white, eventually turning pink. The dark reddish purple fruit is half an inch (13 mm) wide, with a whitish bloom. "Prunus alleghaniensis" is not common in moist woodlands. It is typically found in elevations between . Prunus alleghaniensis Prunus alleghaniensis, the Allegheny plum, is a species of New World plum, native to the Appalachian Mountains from New York to Kentucky and North Carolina, plus the Lower Peninsula of Michigan. There are old reports of it growing also in New Jersey and Connecticut, but it now appears to have been