Syconia may also develop lateral, basal, or peduncular bracts. Petioles, rachis, cirrus and peduncular bracts are covered with short, curved spines. Posterior thalamic lesions were also found to be linked to peduncular hallucinosis by De Morsier. Pleonanthy, monoecy, crownshafts, peduncular bracts, and the lack of armament characterize all members. The second and third peduncular segments of the antenna are broad and the eyestalks retract. Peduncular hallucinations are independent of seizures, unlike some other visual hallucinations. Peduncular hallucinosis therefore might emanate from disturbances in distal portions of the visual system. The peduncular glands consist of a few secretory cells on top of a single-celled stalk.