- sorediumA common scalelike reproductive structure in lichens consisting of algal cells enveloped in a network of hyphae.
- sorosilicateAny silicate based on the dimeric anion Si₂O₇⁶⁻.
- sorosisAny multiple fruit, usually fleshy, that is derived from the multiple ovaries in an infructescence. Such a structure typically includes remnants of floral tissues such as the perianth. Examples include the mulberry and pineapple.
- sorusAny reproductive structure, in some lichens and fungi, that produces spores.