species fungus family found northeastern southeastern southern united_states southern canada grows small groups ground mixed woods fruit body white brownish caps measure diameter stems long thick surface cap covered reddish brown grayish brown conical stem base covered grayish brown scales fruit bodies smell like powder known poisonous mushroom recommended consumption taxonomy species described american botanist monograph eastern united_states description based specimens collected locations north_carolina september october specific honors mycologist collected described mushrooms southern late 19th century chose place genus change adopted later authors classified section genus species distinguished characteristics composed cellular structures varying shape rows large cylindrical slender club shaped cells dominant stem typically base remnants surface concentrated base nearly forming limb base stem forming patches surface cap outer layer consists hyphae pressed surface description cap wide depending age ranges shape convex flattened shallow central depression color vary whitish yellowish white brownish gray brownish orange grayish brown lighter margin cap surface covered remnants universal veil small reddish brown grayish brown easily conical approaching edge cap gradually small patches cap margin smooth faint grooves underlying gills partial veil remnants hanging edge gills free attachment stem close crowded moderately broad yellowish white occasionally slight reddish stain short gills extend completely cap margin stem cut sharply stem long wide equal tapering slightly apex whitish smooth basal club shaped shaped rounded pointed usually covered rings reddish brown scales universal veil remains extending stem short distance universal veil stem base unusual forms extend nearly stem roots soil beneath elongated cord known partial veil forms ring somewhat fragile moderately persistent yellowish white pale yellow eventually mushroom matures collapses stem thin membrane flesh white weak odor powder microscopic characteristics spore print white spores ellipsoid elongated hyaline translucent thin walled dimensions meaning absorb stained melzer reagent basidia spore bearing cells club shaped spored bases cheilocystidia cystidia found edge gill ellipsoid club shaped abundant cap cuticle thick interwoven radial hyphae diameter slightly strongly universal veil cap consists mainly roughly spherical ellipsoid club shaped elongated cells arranged short terminal chains relatively sparse hyphae measuring diameter base stem universal veil tissue similar cap clamp connections present hyphae edibility considers mushroom edible field guide north american mushrooms list possibly poisonous indicate specific reports reported species recommend general species subgenus consumed similar species colored resembles differs small medium sized fruit bodies grayish veil dark gray brownish gray basal usually somewhat fruit bodies confused distinguished presence reddish brown grayish brown remnants distribution habitat fruit bodies grow ground mixed coniferous deciduous forests collected alabama georgia massachusetts maryland michigan north_carolina new_jersey new_york pennsylvania tennessee texas virginia vermont west_virginia field guide notes preference association oak ground cover bushes mushroom collected quebec canada southern extent range extends mexican state mushroom fruits commonly late summer fall heavy rains
Amanita atkinsoniana