 The closely related species Verpa <unk> typically has a smooth cap , although specimens with wrinkled caps are known . V. <unk> may be distinguished microscopically by its eight @-@ spored asci . Its North American range extends much further south than V. bohemica . Another similar group of species are the " half @-@ free " morels , Morchella semilibera and others , which have a <unk> cap that is attached to the stalk for about half of its length , and with ridges that are darker than the pits . Additionally , a cross @-@ <unk> stem of a specimen of M. semilibera is hollow , while V. bohemica usually has <unk> <unk> in the stem , and M. semilibera usually has vertical <unk> near the base , while V. bohemica lacks them . Verpa bohemica may be reliably distinguished from all similar species by its much larger spores . 
