Mesostigmatophyceae

The Mesostigmatophyceae are a class of basal green algae found in freshwater.^[3][4][5] In a narrow circumscription, the class contains a single genus, Mesostigma.^[6] AlgaeBase then places the class within its circumscription of Charophyta.^[1] A clade containing Chlorokybus and Spirotaenia may either be added,^{[7][8][9][10][11][12]} or treated as a sister, with Chlorokybus placed in a separate class, Chlorokybophyceae.^[13] When broadly circumscribed, Mesostigmatophyceae may be placed as sister to all other green algae, or as sister to all Streptophyta.^[14][15][16]

Mesostigmatophyceae
Mesostigma viride
Scientific classification
Kingdom:	Plantae
Division:	Charophyta
Class:	Mesostigmatophyceae Marin & Melkonian, 1999[1][2]
Type species
Mesostigma viride Lauterborn