Synonyms: Hemimycena subnigricans, Marasmius subnigricans.
Marasmiellus subnigricans is a small to medium-sized mushroom with a dark brown to black cap, typically 1-3 cm in diameter, and a slender stem. It grows in clusters on decaying wood, particularly oak and elm, in humid environments. In East and Central Texas, it has been found in wooded areas, often near streams or rivers, during the spring and fall months. The fungus is relatively rare in the region, but can be locally common in certain areas with suitable habitat.
Gills of a white Marasmioid mushroom Marasmiellus subnigricans or may be Heliomyces decolorans on Kiwanis Nature Trail. College Station, Texas, May 25, 2018
Cap of a white Marasmioid mushroom Marasmiellus subnigricans or may be Heliomyces decolorans on Kiwanis Nature Trail. College Station, Texas, May 25, 2018
Slender fragile white Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans in grass on roadside in Lick Creek Park. College Station, Texas, June 21, 2018
Very fragile white Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans in grass on roadside in Lick Creek Park. College Station, Texas, June 21, 2018
Fragile white Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans grown in grass after a rain in Lick Creek Park. College Station, Texas, June 21, 2018
White Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans near a trail in Lick Creek Park. College Station, Texas, June 21, 2018
White translucent Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans grown in grass after a rain in Lick Creek Park. College Station, Texas, June 21, 2018
Small white Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans on pieces of wood in Lick Creek Park. College Station, Texas, July 11, 2018
Small white Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans found in an oak forest in Lick Creek Park. College Station, Texas, July 11, 2018
Gills of white Marasmioid mushroom Marasmiellus subnigricans or may be Heliomyces decolorans in Lick Creek Park. College Station, Texas, July 11, 2018
White Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans on a log on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, September 15, 2018
Caps of white Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans on a log on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, September 15, 2018
White Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans under small oaks in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, September 26, 2018
Large Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans in Lick Creek Park. College Station, Texas, October 3, 2018
Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, July 3, 2019
White Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans in Hensel Park. Bryan, Texas, May 29, 2020
Gills of a small Marasmioid mushroom Marasmiellus subnigricans or may be Heliomyces decolorans in Hensel Park. College Station, Texas, July 8, 2021
Small Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans in Hensel Park. College Station, Texas, July 8, 2021
Underside of small Marasmioid mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans in Hensel Park. College Station, Texas, July 8, 2021
Gills of a mushroom Marasmiellus subnigricans or may be Heliomyces decolorans growing on magnolia leaves on Winters Bayou Trail in Sam Houston National Forest. Cleveland, Texas, September 18, 2021
Spores of mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans collected near Caney Creek in Sam Houston National Forest north from Montgomery a day before. Texas, August 22, 2022
Spores of mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans under a microscope, collected near Caney Creek in Sam Houston National Forest north from Montgomery a day before. Texas, August 22, 2022
Spore size 14.4 - 17.1 × 4.2 - 4.9 µm, length to width ratio Q = 3.2 - 3.8.
Spores of mushrooms Marasmiellus subnigricans or may be Heliomyces decolorans (no pictures of the fungus were taken) collected in Sam Houston National Forest. Texas, September 3, 2022
Omphalinoid mushrooms Marasmiellus subnigricans(?) on a fallen mossy tree on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, September 4, 2022
Side view and gills of omphalinoid mushrooms Marasmiellus subnigricans(?) on a fallen mossy tree on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, September 4, 2022
Gills of a mushroom Marasmiellus subnigricans in Hensel Park. College Station, Texas, September 9, 2022
Spores of mushrooms Marasmiellus subnigricans collected in Hensel Park. College Station, Texas, September 9, 2022
Mushrooms Marasmiellus subnigricans(?) on an oak log in Hensel Park. College Station, Texas, May 8, 2023
Underside of a mushroom Marasmiellus subnigricans in Lick Creek Park. College Station, Texas, May 4, 2024
Gills of a mushroom Marasmiellus subnigricans in Lick Creek Park. College Station, Texas, May 4, 2024
Mushrooms Marasmiellus subnigricans on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, May 14, 2024
Underside of mushrooms Marasmiellus subnigricans on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, May 14, 2024
Gills of mushrooms Marasmiellus subnigricans on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, May 14, 2024
White Marasmius-like mushrooms Marasmiellus subnigricans when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, August 31, 2024Observations of the fungus Marasmiellus subnigricans were made in East and Central Texas from 2018 to 2024. The fungus was found in various locations, including College Station, Huntsville, Bryan, and Sam Houston National Forest. It grew on different substrates such as grass, wood, logs, and magnolia leaves. The mushrooms were typically white, fragile, and small, with some observations noting their translucent or omphalinoid characteristics. Some observations included microscopic examination of spores. The fungus was often found near trails, in parks, and after rainfall. The observations suggest that Marasmiellus subnigricans is widespread in the region and can be found in various habitats, including forests and grasslands. The use of ultraviolet light revealed fluorescence in some specimens. Overall, the observations provide a record of the fungus's distribution and characteristics in East and Central Texas.
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