Synonyms: Hypocrea contorta, Hypocrea rigens, Hypocrea schweinitzii, Sphaeria contorta, Sphaeria rigens, Sphaeria schweinitzii.
Trichoderma citrinoviride is a species of fungus in the family Hypocreaceae, characterized by its greenish-yellow to yellowish-green conidial masses and cylindrical to subcylindrical phialides. In East and Central Texas, it has been isolated from soil, decaying wood, and plant debris, often exhibiting mycoparasitic behavior against other fungi. It is commonly found in association with various tree species, including oak, pine, and cedar, and has been reported to have potential applications in biological control of plant pathogens and bioremediation of contaminated soils.
Tiny black Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark with whitish wood on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Tiny black buttons of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Close-up of tiny black buttons of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Texture of tiny black buttons of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Tiny black buttons of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark at sunrise on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Close-up of tiny black buttons of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark at sunrise on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Asci with spores (in lugol at low magnification) of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Asci with spores (in lugol) of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Asci with spores (in Congo Red at low magnification) of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Asci with spores (in Congo Red) of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Some tissues of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Round spores inside asci of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Asci and paraphyses of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected on Richards Loop Trail in Sam Houston National Forest. Texas, December 17, 2023
Spores of Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) from a fallen pine, collected a day before on Richards Loop Trail in Sam Houston National Forest. Texas, December 18, 2023
Spore size 3.4 - 3.9 × 3 - 3.4 µm, length to width ratio Q = 1 - 1.3.
Close-up of tiny black Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark on Richards Loop Trail in Sam Houston National Forest. Texas, January 27, 2024Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Tiny black Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine without bark on Richards Loop Trail in Sam Houston National Forest. Texas, January 27, 2024Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Black Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) growing together with Trichaptum on a fallen pine without bark on Richards Loop Trail in Sam Houston National Forest. Texas, January 27, 2024Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Close-up of black Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) growing together with Trichaptum on a fallen pine without bark on Richards Loop Trail in Sam Houston National Forest. Texas, January 27, 2024Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Growth pattern of tiny black Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a fallen pine on Richards Loop Trail in Sam Houston National Forest. Texas, January 27, 2024Lone Star Hiking Trail, Montgomery County, Texas, 77873, United States
Habitat of tiny black Ascomycete fungus Trichoderma citrinoviride (Hypocrea schweinitzii) on a thick fallen pine on Richards Loop Trail in Sam Houston National Forest. Texas, January 27, 2024Lone Star Hiking Trail, Montgomery County, Texas, 77873, United StatesTrichoderma citrinoviride was observed growing on fallen pines without bark on Richards Loop Trail in Sam Houston National Forest, East and Central Texas. The fungus appeared as tiny black buttons or Ascomycete fungus, with a whitish wood texture on the host tree. Close-up observations revealed round spores inside asci, as well as asci and paraphyses. The fungus was found growing alone and together with Trichaptum on fallen pines. Its growth pattern was observed, with tiny black buttons forming on the host tree. The habitat of the fungus was noted to be thick fallen pines, specifically on Richards Loop Trail in Sam Houston National Forest. Observations were made over two visits, on December 17, 2023, and January 27, 2024.
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