I would like to use ready-made taxonomic weights in my research and would like to know more about this collection. Where can I find an information what exactly mean 'plant-corpus'? And is it suitable for conifer needles samples?
Plant corpus is described as "tissue of leaf, stem, fruit, algae", so yes this sounds suitable for conifer needle samples. However, if I recall correctly, plant corpus is one of the least common classifications in the EMP data. You might also want to try "Plant Surface", which might be suitable for conifer needles.