e ▁are ▁connected ▁via ▁two ▁distinct ▁types ▁of ▁sept a . ▁The ▁inner ▁one ▁is ▁a ▁single ▁per for ate ▁sept um ▁where ▁wor on in ▁bodies ▁can ▁be ▁observed ▁and ▁represents ▁a ▁typical ▁as com yc et ous ▁sept um . ▁The ▁second ▁sept um ▁which ▁separ ates ▁H ül le ▁cells ▁from ▁the ▁subt ending ▁hy pha e ▁is ▁unique ▁and ▁named ▁bas al ▁sept um . ▁At ▁the ▁bas al ▁sept um ▁ves icle ▁fusion ▁is ▁observable . ▁Con sequently , ▁to ▁this ▁fusion ▁so ▁called ▁l omas ome - like ▁accum ulations ▁are ▁visible . ▁These ▁l omas ome - like ▁structures ▁are ▁memb rane - inv agin ations . ▁In ▁H ül le ▁cells ▁several ▁nuc lei , ▁mit och ond ria , ▁li pid ▁bodies ▁and ▁storage ▁products ▁can ▁be ▁observed ▁( E ll is ▁et ▁al ., ▁ 1 9 7 3 ). ▁During ▁initial ▁H ül le ▁cell ▁formation , ▁it ▁was ▁shown ▁that ▁several ▁nuc lei ▁f use ▁to ▁form ▁a ▁marc ron uc le us ▁( Car val ho ▁et ▁al ., ▁ 2 0 0 2 ). ▁D ifferent ▁species ▁of ▁the ▁genus ▁As per g ill us ▁produce ▁H ül le ▁cells , ▁including ▁As per g ill us ▁n id ul ans ▁and ▁As per g ill us ▁heter oth all icus ▁( B ay ram ▁and ▁Bra us ▁ 2 0 1 2 ). ▁H ül le ▁cells ▁have ▁an ▁average ▁size ▁of ▁ 1 2 - 2 0