Synonym: Gymnosporangium fuscum.
Common name: Juniper-hawthorn rust.
Extract from Wikipedia article: Gymnosporangium globosum is a plant pathogen that causes cedar-hawthorn rust.
Gymnosporangium globosum is a rust fungus that infects juniper and cedar trees, producing orange to yellow gelatinous telial horns on the underside of branches. In East and Central Texas, it is commonly found on eastern red cedar (Juniperus virginiana) and other juniper species, typically causing minimal harm to the host tree. The fungus overwinters on juniper, then produces spores that infect apple, pear, and quince trees in the spring, causing disease in these rosaceous hosts.
Cedar-hawthorn rust fungus (Gymnosporangium globosum)(?) on littlehip hawthorn (Crataegus spathulata) in Sam Houston National Forest, on Little Lake Creek Loop Trail. Richards, Texas, May 18, 2014
Little Lake Creek Loop Trail, Sam Houston National Forest, Montgomery, TX 77356, USA
Cedar-hawthorn rust fungus (Gymnosporangium globosum) on littlehip hawthorn (Crataegus spathulata) in Lick Creek Park. College Station, Texas, April 18, 20181409 Torrey Pines Court, College Station, TX 77845, USA
Leaves of littlehip hawthorn (Crataegus spathulata) with cedar-hawthorn rust fungus (Gymnosporangium globosum) in Lick Creek Park. College Station, Texas, April 18, 20181409 Torrey Pines Court, College Station, TX 77845, USA
Cedar-hawthorn rust fungus (Gymnosporangium globosum) on leaves of Engelmann's hawthorn (Crataegus engelmannii) in Lick Creek Park. College Station, Texas, May 7, 2018
Juniper-hawthorn rust fungus (Gymnosporangium globosum) on littlehip hawthorn (Crataegus spathulata) with pycnia near a pond on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Leaves of littlehip hawthorn (Crataegus spathulata) with pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum) on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
Pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum) on leaves of littlehip hawthorn (Crataegus spathulata) on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
Tissues infected by Juniper-hawthorn rust fungus (Gymnosporangium globosum) under a microscope in KOH, from upper surface of leaves of littlehip hawthorn (Crataegus spathulata), collected on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
Pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum) under a microscope in KOH, from upper surface of leaves of littlehip hawthorn (Crataegus spathulata), collected on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
Cedar-hawthorn rust fungus (Gymnosporangium globosum) on littlehip hawthorn (Crataegus spathulata) on Richards Loop Trail in Sam Houston National Forest. Texas, April 13, 2024Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Littlehip hawthorn (Crataegus spathulata) with cedar-hawthorn rust fungus (Gymnosporangium globosum) in Lick Creek Park. College Station, Texas, May 6, 2024Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Leaves of littlehip hawthorn (Crataegus spathulata) with cedar-hawthorn rust fungus (Gymnosporangium globosum) in Lick Creek Park. College Station, Texas, May 6, 2024Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Spores and tissues of cedar-hawthorn rust fungus (Gymnosporangium globosum) collected in Lick Creek Park. College Station, Texas, May 6, 2024
Conidiospores and tissues of cedar-hawthorn rust fungus (Gymnosporangium globosum) collected in Lick Creek Park. College Station, Texas, May 6, 2024Observations of Gymnosporangium globosum were made on littlehip hawthorn (Crataegus spathulata) and Engelmann's hawthorn (Crataegus engelmannii) in East and Central Texas. The fungus was found in Sam Houston National Forest, Richards, Texas, and Lick Creek Park, College Station, Texas, on multiple dates between 2014 and 2024. Infected leaves were observed with pycnia and spores, and microscopic examination of infected tissues revealed the presence of the fungus. The observations suggest that Gymnosporangium globosum is present in the region and infects hawthorn species, particularly littlehip hawthorn. The fungus was found near ponds and on trails, indicating its potential to spread through water and human activity. The repeated observations over several years indicate a persistent presence of the fungus in the area.
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