Abstract
It is frequently observed that the rough touch appearance develop on the surface of shell in which the filaments thrive during the long cultivation of Conchocelis. This phenomenon is called often “Samehada (Goose-skin-like) disease”. Results observed are summarized as follows:
1. The profile view of rough touch surface shows that such portion of surface consists of numerous hemispheric projections having cocentric circle lines in section (Plate I, A-H).
2. These projections are supposed to be composed of some calcium salt. 3. It seems that filaments-like passages pierce these projections and have outlets on those surfaces (Plate I, A-H). 4. No remarkable difference is observed between both rough surfaces of oyster shell (Plate I, G.H) and of pearl oyster shell (Plate I, A-F) in structure. 5. Crystals of some calcium salt are also deposited on the bottom of culture vessel during long cultivation (Plate II, A•B).
