mcaime's Identifications

On juniper. Abundant on many junipers along Three Oaks Dr.
Photos 1,2,3 on March 16, photos 4,5,6 from March 19

For later, balloon stage, see https://www.inaturalist.org/observations/71610567

ID G. clavipes confirmed from these photos by Roger Peterson and Cathie Aime.

CATHIE AIME
[The ballooning is] called a telium. (Telia are one of the 4 different sorus types that are produced by rust fungi). This type of really large, gelatinous, orange telium is really just seen in Gymnosporangium species (although a few other rust genera can also produce gelatinous and/or orange telia, they are much smaller and don’t swell up like this in the presence of water). Some Gymnosporangiums produce even more elaborate telia. Google G. clavariiforme or G. juniperi-virginianae for instance…

ROGER PETERSON
Known as quince rust but it infects nearly all members of the apple tribe as well as juniper.
"gelatinization." Nearly all species of Gymnosporangium have teliospore pedicels that swell greatly in water.

On Juniper. Images 1 to 7 taken 10 hours after a 2 inch rain. Images eight and nine taken four days later.

ID G. clavipes confirmed from these photos by Roger Peterson and Cathie Aime.

For early stage eruption, see https://www.inaturalist.org/observations/71392246

CATHIE AIME
[The ballooning is] called a telium. (Telia are one of the 4 different sorus types that are produced by rust fungi). This type of really large, gelatinous, orange telium is really just seen in Gymnosporangium species (although a few other rust genera can also produce gelatinous and/or orange telia, they are much smaller and don’t swell up like this in the presence of water). Some Gymnosporangiums produce even more elaborate telia. Google G. clavariiforme or G. juniperi-virginianae for instance…

ROGER PETERSON
Known as quince rust but it infects nearly all members of the apple tribe as well as juniper.
"gelatinization." Nearly all species of Gymnosporangium have teliospore pedicels that swell greatly in water.