 The holotype of Protomycena is a single fruit body without any associated structures , preserved in a piece of clear light yellow polished amber approximately 4 @.@ 5 – 2 @.@ 5 cm ( 1 @.@ 77 – 0 @.@ 98 in ) wide . The pileus is 5 mm ( 0 @.@ 2 in ) in diameter and has a convex shape , sporting a raised central region ( an umbo ) . The pale flesh appears yellowish in the amber , and is smooth and glossy , changing to striate and slightly translucent towards the margin . The pileus margin is striated and slightly flared . The gills on the underside of the pileus are broadly attached ( adnate ) to the top of the stipe , and distantly spaced — between six and eight gills extend completely from the pileus margin to the stipe . These full @-@ length gills are anastomosed with lamellulae ( short gills which do not reach the edge of the stipe from the pileus margin ) of varying lengths . The pileus is centered on the curved stipe , which is smooth and cylindrical , measuring 0 @.@ 75 mm ( 0 @.@ 030 in ) thick by 10 mm ( 0 @.@ 39 in ) long . The stipe lacks a ring and rhizoids . The mushroom is preserved with a small liquid and gas @-@ filled bubble , possibly originating from the mushroom itself , which indicates the amber to be very solid and well @-@ sealed . 
 The holotype of Protomycena <a href='drop_aux' title='1'><mark>is</mark></a>a single fruit body without any associated structures , preserved in a piece of clear light yellow polished amber approximately 4 @.@ 5 – 2 @.@ 5 cm ( 1 @.@ 77 – 0 @.@ 98 in ) wide . The pileus <a href='drop_aux' title='2'><mark>is</mark></a>5 mm ( 0 @.@ 2 in ) in diameter and <a href='got' title='3'><mark>has</mark></a> a convex shape , sporting a raised central region ( an umbo ) . The pale flesh <a href='uninflect' title='4'><mark>appears</mark></a> yellowish in the amber , and <a href='drop_aux' title='5'><mark>is</mark></a>smooth and glossy , changing to striate and slightly translucent towards the margin . The pileus margin is striated and slightly flared . The gills on the underside of the pileus are broadly attached ( adnate ) to the top of the stipe , and distantly spaced — between six and eight gills extend completely from the pileus margin to the stipe . These full @-@ length gills <a href='drop_aux' title='6'><mark>are</mark></a>anastomosed with lamellulae ( short gills which do not reach <a href='None' title='7'><mark>the</mark></a><a href='negative_concord' title='8'><mark>edge</mark></a> of the stipe from the pileus margin ) of varying lengths . The pileus is centered on the curved stipe , which <a href='drop_aux' title='9'><mark>is</mark></a>smooth and cylindrical , measuring 0 @.@ 75 mm ( 0 @.@ 030 in ) thick by 10 mm ( 0 @.@ 39 in ) long . The stipe <a href='uninflect' title='10'><mark>lacks</mark></a> a ring and rhizoids . The mushroom is preserved with a small liquid and gas @-@ filled bubble , possibly originating from the mushroom itself , which <a href='uninflect' title='11'><mark>indicates</mark></a> the amber to be very solid and well @-@ sealed . 
Da holotype of Protomycena a single fruit body without any associated structures , preserved in a piece of clear light yellow polished amber approximately 4 @.@ 5 – 2 @.@ 5 cm ( 1 @.@ 77 – 0 @.@ 98 in ) wide . The pileus 5 mm ( 0 @.@ 2 in ) in diameter and got a convex shape , sporting a raised central region ( an umbo ) . Tdapale flesh appear yellowish in thdaeva , and smooth and glossy , changing to striate and slightly translucent towards the margin . Thedaleus margin is striated and slightly flared . The dals on the udarside of the pileus are broadly attached ( adnate ) to the todaf the stida, and distantly spaced — between six and eight gills extend completely from the piledamargin to the stipedaThese full @-@ length gills anastomosed with lamellulae ( short gills which do not reach no edge of the stipe from the pileus margin ) of varying lengths . The pileus is centered on the curveddaipe , which smooth and cylindrical , measuring 0 @.@ 75 mm ( 0 @.@ 030 in ) thick by 10 mm ( 0 @.@ 39 in ) long . The stipe lda a ring and rhizoids . The mushroom is preserved with a small liquid and gas @-@ filled bubble , possibly originating from the mushroomdaself , which indicate the amber to be very solid and well @-@ sealed .