Mature thalli were contained in small polyethylene baskets which fastened on the denuded stones. Embryos liberated from the thalli were allowed to settle on the stones around the baskets. The plants developed from the embryos to reach 95 cm long in late March of the next year, smaller than that of the natural thalli 129 cm long which developed from rhizomes. It became clear that H. fusiformis could reach harvest able length in a year under suitable biological and environmental conditions.