Micro algae
All unicelluar algae are termed as Micro-algae except Acetabularia. And most of the prokartic filamentous and colonies also comes under micro algae. so scientifically all algae which are unable to seen through our naked eyes are termed as Microalgae.
Hence these are micro in size one cannot make a dried preservation on paper using herbarium making techniques. So micro algae can be preserved in two ways one is liquid preservation, and another is Permanent slide. these two also will serve the purpose of herbarium i.e. reference material for future studies. AARI Herbarium accepts permanent slides and liquid preserved materials.
