M. leptocephala differs in sulcate p., and M. metata in white gills.
Differs from C. stenocoleus in sulcate pileus and umber stem.
Differs from M. corticola in narrow gills, and striate not sulcate pileus.
Differs from T. tigrinum in white gills and sulcate margin of pileus.
Six marginal spines of equal size and at equal distances, triangular, sulcate, half as long as the radius.
Sporangium ovoid-oblong; the calyculus small, sulcate and ribbed, granulose.
It is strongly zoned and sulcate, marking off each year's growth.
Sporangium cylindric; the calyculus small, granulose, ribbed and sulcate.
The plant is reddish-brown and it differs from other species "with sulcate mouths, in its closely sessile endoperidium."
It is easily distinguished by its peculiar bright, shining, longitudinally striate to sulcate stem.
sulcate sul·cate (sŭl'kāt')
Having narrow, deep grooves.