This link will lead you to a morphological key with descriptions and over 500 images for the 32 species of Trichoderma that represent a majority of the taxa found in temperate regions, compiled by Dr. Gary J. Samuels from USDA, Beltsville, USA. The key also includes species of Hypocrea that have unnamed Trichoderma stages. This database will grow as additional taxa of both Trichoderma and Hypocrea are added. The key and descriptions are derived from a character database used by Gary Samuels in his ongoing study of Trichoderma and Hypocrea. The characters in the interactive key are those that are of most value in delimiting the taxa. The characters included are all derived from the observation of material growing in culture.