Abstract
Sand stones, and pyramidal and prismatic concrete blocks were set as the cellecters of Geliaium in the sea off the coast of Tokushima pref. in July, September and November, 1953.
Some of the collecters were recovered by divers for exammination on June 1, 1954. and the weight of Gelidium growing on each collecter was recorded. The data was analized statistically with the following results.
1) The weight of attaching Gelidium did not differ significantly on the stone and the collecters.
2) Gelidium was found attaching on the collecters set in the three different months. Attachment was richest on the collecters set in July, and poorest on those set in November.
3) Geliaium attached on collecters far more abundantly on the shore facing the west and south than on the shore facing other directions.
4) Selecting suitable sites, therefore, is most important in propagating Gelidium by setting collecters.
