Gymnosporangium

(_Gymnosporangium_), causing a so-called "cedar apple," × ½.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

_Gymnosporangium_, 79-81; Fig.  47. cedar apples, 79. spores, 80.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

Of the commoner genera _Melampsora_, and _Uromyces_ (Fig.  47, _L_ i), have unicellular teleuto spores; _Puccinia_ (ii) and _Gymnosporangium_, two-celled spores; _Triphragmium_, three-celled; and _Phragmidium_ (iii), four or more.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

(_Gymnosporangium_), forming the growths known as "cedar apples," often met with on the red cedar.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

The stems of the junipers so common in the neighborhood of Silverdale (near Morecambe Bay) used to be distorted with _Gymnosporangium_, and covered with the _teleutospores_ of this fungus every spring: in July all the hawthorn hedges in the neighborhood had their leaves covered with the Æcidium form (formerly called Roestelia), and it was quite easy to show that the fungus on the hawthorn leaves was produced by sowing the _Gymnosporangium_ spores on them.

Scientific American Supplement, No. 664, September 22,1888 Various

Another well known example is that of the fungus _Gymnosporangium_, which injures the wood of junipers.

Scientific American Supplement, No. 664, September 22,1888 Various

Frame rate = 50,000 f.p.s. Ultra-high speed video clip showing ballistospore discharge in rust fungus Gymnosporangium juniperi-virginianae.

PLoS ONE Alerts: New Articles 2009

Galls bearing telial horns Gymnosporangium juniperi-virginianae were collected from infected eastern red cedar (

PLoS ONE Alerts: New Articles 2009

Gymnosporangium juniperi-virginianae) fell within the laminar flow regime, characterized by Reynolds numbers below 1.0.

PLoS ONE Alerts: New Articles 2009