The lateral geniculate nucleus sends signals to primary visual cortex, also called striate cortex. The stipe is central, cylindrical or slightly swollen at the base, dry and longitudinally striate. Orientation columns are located in the primary visual cortex also known as the striate cortex. More modern texts divide the anterolateral central arteries into lateral and medial striate arteries. Ocular dominance columns are also found in the striate cortex. In the monkeys, the striate cortex of the left hemisphere was surgically removed. The stem is striate (longitudally ribbed) and pubescent. Some layers of the striate cortex were found to contain orientation and direction selective cells. They recorded 1410 cells in 45 penetrations into the striate cortex. The body whorl is long and rather cylindrical, closely striate below. The cap margin is striate and rolled inwards. The black seed coat is almost smooth to finely striate, rugulose or pitted. The margin becomes slightly striate in age. The mushroom is commonly known as the "conifer Psilocybe" or the "striate Psilocybe". Most have a translucent and striate cap, which rarely has an incurved margin.