Ultrastructure of the ascospores of some species of the Torulaspora group

Antonie Van Leeuwenhoek. 1976;42(4):445-55. doi: 10.1007/BF00410175.


Development and germination of the ascospores in species of the Torulaspora group of yeasts have been described. Most species had warty spores which, in sections, showed a dark outer layer consisting of the outer unit membrane of the prospore wall and a layer underneath formed at an early stage of development of the spores. In mature spores the light inner layer of the wall was delimited at the outside by a thin dark layer. The warts often contained dark material. The ascospores of two Pichia and three Debaryomyces species were studied for comparison; they differed in sections from the Torulaspora spores. The taxonomic implications of the ultrastructural observations have been discussed.

Publication types

  • Comparative Study

MeSH terms

  • Pichia / ultrastructure
  • Reproduction, Asexual
  • Saccharomyces / ultrastructure*
  • Spores, Fungal / growth & development
  • Spores, Fungal / ultrastructure*