Gymnosporangium kernianum Bethel 1911

Gymnosporangium kernianum Bethel, Mycologia 3 : 157. 1911
O and I. Pycnia and aecia uncertain.
On Malaceae :
Afuelanchier sp. Proven by culture as to host, but without maturing aecia.
Telia caulicolous, from a perennial mycelium, arising between the scale-like leaves on the green twigs, causing a fasciation of the young shoots and forming globose witches' brooms 15-45 dm. in diameter, not causing a reversion to the juvenile form, scattered, usually solitary, hemispherical, 0.5-0.8 mm. across, rather compact, dark reddish-brown ; teliospores chiefly 2-celled, narrowly ellipsoid, 21-26 by 55-74 ,«, narrowed or sometimes rounded at both ends, slightly or not constricted at the septum-; wall thin, about IfJ-, yellowish, the pores usually 2 in each cell, near the septum ; pedicel cylindrical.
On Juniperaceae :
Juniperus utahensis {'Sin^^Xvi.') I^emm., Colorado. Type locality: Paonia, Colorado, onjuniperus uiahensis. Distribution : Western Colorado.

Gymnosporangium kernianum is a fungal plant pathogen.