Synonyms: Agaricus thomsonii, Entoloma thomsonii, Pluteus cinereus, Pluteus tenuiculus, Pluteus thonsoni.
Common name: veined shield.
Pluteus thomsonii is a small to medium-sized agaric fungus with a bell-shaped to convex cap that ranges in color from grayish-brown to tan, often with a distinctive umbo. The gills are free, crowded, and pinkish-gray to pink. It grows in clusters or scattered on decaying wood, especially hardwoods, in urban and natural areas. In East and Central Texas, Pluteus thomsonii has been found fruiting from spring to fall, typically in moist, shaded environments, such as along streams, in woodland edges, and under trees in parks and gardens.
Gills of Pluteus thomsonii mushroom in Lick Creek Park. College Station, Texas, April 14, 2019
14802 Rock Prairie Rd, College Station, TX 77845, USA
Small mushroom Pluteus thomsonii in Lick Creek Park. College Station, Texas, April 14, 201914802 Rock Prairie Rd, College Station, TX 77845, USA
Side view of Pluteus thomsonii mushroom on rotting oak wood on Kiwanis Nature Trail. College Station, Texas, April 13, 20201200 Ashburn Ave, College Station, TX 77840, USA
Pluteus thomsonii mushroom on rotting oak wood on Kiwanis Nature Trail. College Station, Texas, April 13, 20201200 Ashburn Ave, College Station, TX 77840, USA
Pluteus thomsonii mushrooms on a rotting oak log on Kiwanis Nature Trail. College Station, Texas, April 13, 20201200 Ashburn Ave, College Station, TX 77840, USA
Pluteus thomsonii mushrooms on an oak log on Kiwanis Nature Trail. College Station, Texas, April 13, 20201200 Ashburn Ave, College Station, TX 77840, USA
Caps of Pluteus thomsonii mushrooms on an oak log on Kiwanis Nature Trail. College Station, Texas, April 13, 20201200 Ashburn Ave, College Station, TX 77840, USA
Spore print of a mushroom Pluteus thomsonii taken from Kiwanis Nature Trail. College Station, Texas, April 14, 20201700 George Bush Dr, College Station, TX 77840, USA
Veined shield mushrooms (Pluteus thomsonii)(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, June 27, 2021Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Cap and side view of veined shield mushrooms (Pluteus thomsonii)(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, June 27, 2021Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Veined shield mushroom (Pluteus thomsonii) under small oaks and Yaupon in Lick Creek Park. College Station, Texas, July 2, 2021Yaupon Loop, College Station, TX 77845, USA
Underside of veined shield mushroom (Pluteus thomsonii) under small oaks and Yaupon in Lick Creek Park. College Station, Texas, July 2, 2021Yaupon Loop, College Station, TX 77845, USA
Veined shield mushroom (Pluteus thomsonii)(?) in Lick Creek Park. College Station, Texas, July 3, 2021Iron Bridge Trail, College Station, TX 77845, USA
Underside of veined shield mushroom (Pluteus thomsonii)(?) in Lick Creek Park. College Station, Texas, July 3, 2021Iron Bridge Trail, College Station, TX 77845, USA
Small brown mushrooms Pluteus thomsonii(?) on almost completely rotten oak(?) log on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, January 14, 2023Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Small brown mushrooms Pluteus thomsonii(?) on rotting oak wood on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, January 14, 2023Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Underside of small brown mushrooms Pluteus thomsonii(?) on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, January 14, 2023Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Tissues at low magnification of small brown mushrooms Pluteus thomsonii(?), collected on South Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, January 14, 2023
Tissues with cystidia at low magnification of small brown mushrooms Pluteus thomsonii(?), collected on South Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, January 14, 2023
Cystidia(?) of small brown mushrooms Pluteus thomsonii(?), collected on South Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, January 14, 2023
Basidia and cystidia of small brown mushrooms Pluteus thomsonii(?), collected on South Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, January 14, 2023
Spores (in lugol) of small brown mushrooms Pluteus thomsonii(?), collected on South Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, January 14, 2023
Spores (in KOH) of small brown mushrooms Pluteus thomsonii(?), collected on South Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, January 14, 2023
Spore size 5.5 - 6.3 × 5.2 - 5.6 µm, length to width ratio Q = 1 - 1.1.Pluteus thomsonii was observed growing on rotting oak wood in various locations in East and Central Texas, including Lick Creek Park, Kiwanis Nature Trail, and Sam Houston National Forest. The mushrooms were typically small, with veined caps and gills. They were found on oak logs, stumps, and roots, often in areas with rich soil and abundant vegetation. Observations were made during different times of the year, including April, June, July, and January, suggesting that the fungus can fruit throughout the year. Spore prints were taken, and microscopic examination revealed characteristic features such as cystidia, basidia, and spores. The observations suggest that Pluteus thomsonii is a common species in East and Central Texas, particularly in areas with oak trees and rich soil. The fungus was often found in association with other vegetation, including small oaks and Yaupon.
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