Diagram of various autumn leaves labeled with their tree names: oak, beech, maple, poplar, ash, birch, hickory, elm, walnut.
A digital illustration of a cut tree log showing its cross-section, with labels pointing to different parts such as growth ring, medullary ray, sapwood, pith, heartwood, outer bark, and inner bark. The background is dark with green leaves and the wor
Logo of San Francisco State University featuring a leafless tree and a mushroom with berries, and the text 'San Francisco State University' and 'Harry D. Thiers Herbarium (SFSU)' surrounding the image.