In B. bassiana the spores are produced sympodially. A spore is produced at the tip of the mother cell and the growth of the mother cell ceases. A new growing point initiates just below this terminal spore, grows past it, and a second spore is produced at a higher level. This uses up the new growing point and a third growing point is then initiated just below the second spore. Every time a spore is produced the hyphal tip is used up and a new growing point is produced. In this way a succession of spores is produced with the youngest spore at the tip (= i.e acropetal succession) and the spore head gets longer and longer. When all the spores secede (= are dislodged) the spore-bearing tip of the conidiogenous cell has a zig zag appearance and is referred to as a rachis ( this term is also used for the seed head in wheat when all the seeds are gone).