Nostoc paludosum Kutz.

A large clump of Nostoc sp. filaments

otos courtesy of Roger Burks (University of California at Riverside), Mark Schneegurt
(Wichita State University), and Cyanosite, supported by Purdue University

 

A closeup of Nostoc sp. filaments

Photos courtesy of Roger Burks (University of California at Riverside), Mark Schneegurt
(Wichita State University), and Cyanosite, supported by Purdue University