Synonyms: Coleosporium montanum, Coleosporium solidaginis, Peridermium montanum, Stichopsora asterum, Stichopsora solidaginis, Uredo solidaginis.
Coleosporium asterum is a rust fungus that infects plants in the family Asteraceae, particularly asters and goldenrods. In East and Central Texas, it has been found to commonly infect Symphyotrichum drummondii and other aster species, causing orange to yellow spores to form on the underside of leaves. The fungus is typically active from July to November, with peak activity in September and October. It overwinters as teliospores on infected plant material and resumes activity in the spring with the formation of basidiospores.
Pine seedling with needle rust caused by fungus Coleosporium asterum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
Aecial pustules of a needle rust caused by fungus Coleosporium asterum on pine needles on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
Pine needles with rust fungus Coleosporium asterum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
Pine needles with pustules of rust fungus Coleosporium asterum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
Shoot of tall goldenrod (Solidago altissima) or may be fragrant goldenrod (S. odora) infected by goldenrod rust fungus Coleosporium solidaginis (Coleosporium asterum)(?), collected over a sewage line in Lick Creek Park. College Station, Texas, August 3, 2023
Leaves of goldenrod (Solidago) showing yellow spots with uredinia of goldenrod rust fungus Coleosporium solidaginis (Coleosporium asterum)(?), collected over a sewage line in Lick Creek Park. College Station, Texas, August 3, 2023
Uderside of leaves of goldenrod (Solidago) showing yellow spots with uredinia of goldenrod rust fungus Coleosporium solidaginis (Coleosporium asterum)(?), collected over a sewage line in Lick Creek Park. College Station, Texas, August 3, 2023
Leaves of goldenrod (Solidago) with yellow spots from goldenrod rust fungus Coleosporium solidaginis (Coleosporium asterum)(?), collected over a sewage line in Lick Creek Park. College Station, Texas, August 3, 2023
Urediospores (under a microscope at low magnification) of goldenrod rust fungus Coleosporium solidaginis (Coleosporium asterum)(?) collected over a sewage line in Lick Creek Park. College Station, Texas, August 3, 2023
Large urediospores of goldenrod rust fungus Coleosporium solidaginis (Coleosporium asterum)(?) collected over a sewage line in Lick Creek Park. College Station, Texas, August 3, 2023
Urediospores (stacked image) of goldenrod rust fungus Coleosporium solidaginis (Coleosporium asterum)(?) collected over a sewage line in Lick Creek Park. College Station, Texas, August 3, 2023Observations of the fungus Coleosporium asterum in East and Central Texas reveal its presence on pine seedlings and needles in Sam Houston National Forest, where it causes needle rust. Aecial pustules and pustules of the rust fungus were observed on pine needles in March 2020. Additionally, the fungus was found infecting goldenrod (Solidago) plants in Lick Creek Park, College Station, in August 2023, causing yellow spots with uredinia on the leaves. Microscopic examination revealed urediospores of the fungus, which were large and stacked. The fungus appears to be active in both pine and goldenrod hosts in East and Central Texas, with observations spanning different seasons and locations. The presence of Coleosporium asterum on goldenrod was noted as possibly being Coleosporium solidaginis, highlighting a potential need for further identification.
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