Fig. 73. Vegetative reproduction in Penicillus and Udotea. (Top) An aquarium showing 

 a cluster of young Penicilli aroiuid an old Penicillus with white capituluni. Two 

 other young Penicilli appear in the left foreground. A young Udotea is developing 

 to the left of the large Udotea. All yovmg plants are from rhizoidal runners, and 

 the aquarium had been established five weeks when the photograph was taken. 

 The diameter of the white discs is 0-85 cm. (Bottom) Filaments of the espera stage 

 of Penicillus capitatus from the Caribbean, developed in culture from rhizoidal 

 runners. Scale shown is 11 mm long. (Lower photograph by The Ohio State University 

 Department of Photograph}-.) 



