Synonyms: Agaricus destrictus, Agaricus destricus, Agaricus fastigiatus, Agaricus lacerus, Agaricus rimosus, Agaricus schistus, Agmocybe rimosa, Gymnopus rimosus, Inocybe destricta, Inocybe fastigiata, Inocybe pseudofastigiata, Inocybe rimosa, Inocybe schista, Inocybe umbrinella.
Common names: split fibrecap, Straw-colored Fiber Head.
Pseudosperma rimosum is a species of fungus in the family Inocybaceae. It has a small to medium-sized cap that is bell-shaped to convex, often with a wavy or lobed margin, and ranges in color from brown to grayish-brown. The gills are crowded and attached to the stem, with a similar color to the cap. In East and Central Texas, Pseudosperma rimosum typically fruits in late summer to early fall, often in association with oak and other hardwood trees. It can be found growing solitary or in small groups on the ground in wooded areas, particularly in moist, shaded environments.
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on a lawn on Anderson Street. College Station, Texas, November 4, 2017
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) taken from a lawn on Anderson Street. College Station, Texas, November 4, 2017
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on a lawn on Francis Drive. College Station, Texas, November 15, 2017
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on a lawn on Williams Street. College Station, Texas, November 15, 2017
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on Francis Drive. College Station, Texas, November 17, 2017
Group of fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on a lawn on Francis Drive. College Station, Texas, November 17, 2017
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on Kiwanis Nature Trail. College Station, Texas, November 17, 2017
Fibercap mushrooms Inocybe rimosa (Pseudosperma rimosum) in Lick Creek Park. College Station, Texas, May 30, 2018
Group of fibercap mushrooms Inocybe rimosa (Pseudosperma rimosum) in Lick Creek Park. College Station, Texas, May 30, 2018
Fibercap mushrooms Inocybe rimosa (Inocybe fastigiata, Pseudosperma rimosum) in Lick Creek Park. College Station, Texas, May 31, 2018
Fibercap mushrooms Inocybe rimosa (Inocybe fastigiata, Pseudosperma rimosum) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 16, 2019
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on a grassy field in Hensel Park. Bryan, Texas, April 8, 2020
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum) on a lawn in Wolf Pen Creek Park. College Station, Texas, April 14, 2020
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum)(?) in Lick Creek Park. College Station, Texas, September 20, 2020
Fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum(?)) on a side of the trail under oaks and pines on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, October 23, 2021
Gills of fibrecap mushrooms Inocybe rimosa (Pseudosperma rimosum(?)) on a side of the trail under oaks and pines on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, October 23, 2021
Split fibrecap mushrooms (Pseudosperma rimosum) on a lawn in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, November 16, 2021
Cross section of split fibrecap mushrooms (Pseudosperma rimosum) on a lawn in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, November 16, 2021
Underside of split fibrecap mushrooms (Pseudosperma rimosum) in bushes near a creek on Kiwanis Nature Trail. College Station, Texas, November 16, 2021
Cross section of split fibrecap mushrooms (Pseudosperma rimosum) on Kiwanis Nature Trail. College Station, Texas, November 16, 2021
Gills of a split fibrecap mushroom (Pseudosperma rimosum) on Kiwanis Nature Trail. College Station, Texas, November 16, 2021
Spores of a fibrecap mushroom Pseudosperma rimosum (Inocybe rimosa) taken from Washington-on-the-Brazos 12/24/2021. Texas, February 15, 2022
Split fibrecap mushroom (Pseudosperma rimosum) in Lick Creek Park. College Station, Texas, June 3, 2022
Underside of split fibrecap mushroom (Pseudosperma rimosum) in Lick Creek Park. College Station, Texas, June 3, 2022
Spores of split fibrecap mushroom (Pseudosperma rimosum) at low magnification (spore print brown), collected in Lick Creek Park. College Station, Texas, June 3, 2022
Spores of split fibrecap mushroom (Pseudosperma rimosum) collected in Lick Creek Park. College Station, Texas, June 3, 2022
Small mushroom Pseudosperma rimosum (Inocybe) in muddy area on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, August 21, 2022
Gills of a small mushroom Pseudosperma rimosum (Inocybe) in muddy area on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, August 21, 2022
Spores of mushrooms Pseudosperma rimosum (spore print light brown) from muddy area under a microscope at low magnification, collected near Caney Creek in Sam Houston National Forest north from Montgomery. Texas, August 21, 2022
Spores of mushrooms Pseudosperma rimosum (spore print light brown) from muddy area collected near Caney Creek in Sam Houston National Forest north from Montgomery. Texas, August 21, 2022
Spore size 9.3 - 10.36 × 5.5 - 6 µm, length to width ratio Q = 1.55 - 1.7.
Split fibrecap mushrooms (Pseudosperma rimosum) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, May 11, 2024
Side view of split fibrecap mushrooms (Pseudosperma rimosum) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, May 11, 2024
Top view of split fibrecap mushrooms (Pseudosperma rimosum) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, May 11, 2024
Spores (in KOH) of split fibrecap mushrooms (Pseudosperma rimosum) collected on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, May 11, 2024The fungus Pseudosperma rimosum was observed in East and Central Texas from 2017 to 2024. The majority of sightings were in College Station, with additional observations in Bryan, Montgomery, and Richards. The mushrooms were found in various habitats, including lawns, parks, trails, and forests. They were typically seen growing on the ground, often in groups. The observations included photographs of the mushrooms' caps, gills, and spores, as well as microscopic views of the spores. The sightings occurred during different seasons, with most observations made in the fall and spring. The data suggests that Pseudosperma rimosum is a relatively common species in the region, with a wide distribution and varied habitats. Overall, the observations provide valuable information on the ecology and distribution of this fungus in East and Central Texas.
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