When you see a crack itâs important to determine where it is and how severe it is. In order to figure out whether itâs a big deal, you need to know what kind of foundation system you have. For this article Iâm going to talk about âpier and curtain wallâ foundations. This type of foundation is most common in the pre-1950 houses in Durhamâs in-town neighborhoods.
A gametangium (plural: gametangia) is an organ or cell in which gametes are produced that is found in many multicellular protists, algae, fungi, and the gametophytes of plants. In contrast to gametogenesis in animals, a gametangium is a haploid structure and formation of gametes does not involve meiosis.
Mosses, ferns, and some similar plants have gametangia for reproductive organs, which are part of the gametophyte. The flowers of flowering plants produce pollen and egg cells, but the sex organs themselves are inside the gametophytes within the pollen and the ovule.