A new species, Sphaerospora minuta Cain, is described from soil collected under Pinus banksiana, Algonquin Park, Ontario. Growth in pure culture is rapid on various media. Conidia are produced in Botrytis-like clusters on long, dichotomously branched conidiophores. The conidial stage resembles that of Patella abundans (Karsten) Seaver except for the fewer conidia which have a broader attachment to the ampullae. The method of conidial production in both of these species is described in detail and illustrated. Monoconidial cultures of S. minuta produce mature apothecia which are globose, light-brown, and enclosed in an excipulum covered with numerous slender brown septate hairs. The excipulum remains intact until the apothecium is nearly mature and then splits irregularly to expose the nearly white hymenium. The ascospores are hyaline, globose, smooth, and each contains a single large refractive oil globule. Consideration is given to the validity of the genus Sphaerospora as separate from Humaria (Patella).