Bio fertilizer-The cultured micro-organisms packed in some carrier material for easy  application in the field are called bio-fertilizers. Thus, the critical input in Biofertilizers is the microorganisms. Commonly produced biofertilizers are Rhizobium, Azotobacter, Phosphate Solubilizers, Blue-Green Algae, Azolla, Micorohizae.

Spirogyra, (genus Spirogyra), any member of a genus of some 400 species of free-floating green algae (division Chlorophyta) found in freshwater environments around the world. Named for their beautiful spiral chloroplasts, spirogyras are filamentous algae that consist of thin unbranched chains of cylindrical cells. They can form masses that float near the surface of streams and ponds, buoyed by oxygen bubbles released during photosynthesis. They are commonly used in laboratory demonstrations.

Agaricus is a genus of mushrooms containing both edible and poisonous species, with possibly over 300 members worldwide. The genus includes the common (“button”) mushroom (Agaricus bisporus) and the field mushroom (Agcampestris), the dominant cultivated mushrooms of the West.

Source: ForumIAS