Histone lysine methyltransferase that specifically mono-, di-, and trimethylates 'Lys-37' of histone H3 to regulate sporulation. L-lysyl(37)-[histone H3] + S-adenosyl-L-methionine = H(+) + N(6)-methyl-L-lysyl(37)-[histone H3] + S-adenosyl-L-homocysteine N(6)-methyl-L-lysyl(37)-[histone H3] + S-adenosyl-L-methionine = H(+) + N(6),N(6)-dimethyl-L-lysyl(37)-[histone H3] + S-adenosyl-L-homocysteine N(6),N(6)-dimethyl-L-lysyl(37)-[histone H3] + S-adenosyl-L-methionine = H(+) + N(6),N(6),N(6)-trimethyl-L-lysyl(37)-[histone H3] + S-adenosyl-L-homocysteine Homodimer. Abnormal sporulation resulting in asci with fewer than four spores and with abnormal spore wall morphology. Belongs to the class V-like SAM-binding methyltransferase superfamily.