Growing on decomposing Typha

Seen while completing plant monitoring with Steve Woodmansee in the Hole-in-the-Donut, Restoration Area 2004 in Everglades National Park.

All of my observations from today:
https://www.inaturalist.org/observations?on=2024-04-20&place_id=any&user_id=joemdo

More info about the Hole-in-the Donut restoration area:
https://www.nps.gov/ever/learn/nature/hidprogram.htm

iNaturalist Project for the HID:
https://www.inaturalist.org/projects/everglades-national-park-hole-in-the-donut-restoration

Aquatic, hollow, mostly spherical , firmly attached to substrate, ranging 1-3cm wide, soft, not transparent, olive green Cyanobacteria growing in a clear, shallow, slow-moving freshwater creek.

POSSIBLY

Genus Nostoc A.k.a. Star Jellies. Nostoc is a genus of photosynthetic, Gram-negative cyanobacteria that can be found in both terrestrial and aquatic environments. . . Many members of the Nostoc genus form colonies. These colonies can reach several centimeters in diameter.
Nostoc are a genus of Gram-negative photosynthetic cyanobacteria. Many species of Nostoc possess an outer layer and extensive inner matrix of polysaccharides, giving them their "jelly-like" or gelatinous appearance, and also help to protect them from their environment and can assist in the absorption of moisture. This allows them to survive stressful conditions such as fluctuating temperatures, drought, salt stress, desiccation, UV radiation, and infection by pathogens."
https://en.wikipedia.org/wiki/Nostoc

Order Nostocales--a member of Blue-green Algae, Class Cyanophyceae

Blue-green Algae (Class Cyanophyceae)
"Cyanobacteria a.k.a. Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name cyanobacteria refers to their color (from Ancient Greek κύανος (kúanos) 'blue'), which similarly forms the basis of cyanobacteria's common name, Blue-green Algae, although they are not usually scientifically classified as algae. They appear to have originated in a freshwater or terrestrial environment. . . They often live in colonial aggregates that can take on a multitude of forms."
https://www.inaturalist.org/taxa/196963-Cyanophyceae

Similar looking aquatic Nostoc observations nearby:
https://www.inaturalist.org/observations/25045603