Glaucosphaera Vacuolata, Its Ultrastructure and Physiology1,2

SUMMARY Glaucosphaera vacuolata was recently rediscovered, and isolated by Dr. Richard Starr of Indiana University Physiological and ultrastructural studies have been conducted on this cyanome and are reported for the first time. Glaucosphaera has been found to have low rates of photosynthesis, respiration, and Hill activity. Unusual features noted include the presence of R‐phycocyanin as the major accessory pigment, phycobilisomes, and eyeshot‐like structures in the cyanelles.