commonly known ivory cap cowboy species edible mushroom family fungi widespread europe north_america collected northern africa fruit bodies medium sized pure white wet covered layer thick mushroom difficult pick gills broadly attached stem running family suggests feel fingers like species fungus mycorrhizal association underground fungal penetrate exchange nutrients tree roots common variety forest types grow ground grassy areas type species genus number active chemicals fruit bodies fungus including activity taxonomy species named french botanist divided large genus number tribes equivalent modern sections classified tribe defined genus included fungus named raised tribes rank genus type species genus classified section includes species non smooth spores hyphae tissue hymenium species include mushroom commonly known ivory cap white cap cowboy specific epithet latin meaning ivory description cap broad shape ranging convex flattened raised area center cap age cap margin elevated center cap depressed cap pure white depending moisture environment sticky cap surface smooth margin young specimens rolled inward covered short flesh white thick center cap margin odor taste mild gills somewhat meaning shaped like bow curving upward running stem short distance terms distant space seen gills moderately broad near stem narrowed pure white slightly yellowish buff age dried stem long thick equal width length somewhat tapered downward greatly base surface silky beneath stem covered short pure white grayish dirty age initially stuffed cotton like later hollow caps dried fruit bodies typically remain white stems dry darker especially initially microscopic characteristics viewed mass spore print spores appear white observing light microscope reveals additional details spores ellipsoid smooth measure pale yellow melzer reagent basidia spore bearing cells spored pleurocystidia cheilocystidia gill tissue branching hyphae wide cap cuticle gelatinous narrow hyphae bent typically erect free ends clamp connections present hyphae edibility mushroom edible appealing china milk milk acid mixed starter similar species species differs having cap dry slightly stem frequent association spruce cream colored cap thicker stalk grows pine snow white cap similar appearance smaller cap diameter typically grows species differs pale pinkish buff cap gills distinct sour odor potassium reaction stem white mushroom non gills free attachment stalk habitat distribution fruit bodies grow soil coniferous woods grassy areas fungus prefers soil moist fungus widely distributed north_america found europe poland portugal israel north_africa compounds activity isolated identified fruit bodies built chemical structure called following gamma derivatives identified mushroom acid acid acid acid acid acid acid acid compound acid investigated potential use species agent potato late disease additional secondary discovered include compound named known report discovery compounds represents known occurrence fungal fruit bodies
Hygrophorus eburneus