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.
The Calliergon giganteum is an aquatic plant found growing on the bottom of tundra lake beds and in and around bogs and fens. It is a member of the Siberian tundra biome. Like all mosses, Calliergon giganteum is a bryophyte. They have rhizoids (tiny rootlets) instead of roots. They never have wood stems. They have tiny leaves, usually only one cell thick. There are lots of leaves on the stem. They do not have flowers. They can either reproduce by growing shoots or by sending out spores, which need to be wet to survive. They have two life stages; gametophyte and sporeophyte. There are some ways Calliergon giganteum is unique. It is very slow growing.