![]() This condition is noted in Sphaerocarpus sporophyte which consists of a sterile bulbous foot, a narrow sterile seta developed from hypobasal cell and a fertile capsule developed from endothecium containing sporocytes and sterile nurse cells. The development of sporophyte is like that of Corsinia, but there is more sterilisation of sporogenous tissue. ![]() Thus, the zygote has polarity showing more sterilisation of sporogenous cells like nurse cells and sterile foot. The amphithecium forms a single-layered sterile jacket of the capsule, while the endothecium differentiates into fertile sporocytes and long sterile elater-like nurse cells without the thickening bands. ![]() The epibasal cells differentiates into an outer amphithecium and inner endothecium. A small foot is formed from the hypobasal cell. In this stage, the zygote divides transversely to form a hypobasal and an epibasal cells. The amphithecium forms the sterile jacket while the whole sporogenous cells (endothecium) differentiates into spores with a very few sterile nurse cells, possibly the forerunners of elaters. Subsequently 20-30 celled embryo is formed by further divisions, in which periclinal divisions differentiate a single layered outer amphithecium and the inner multicellular mass, the endothecium. The zygote divides by a transverse wall, followed* by a vertical wall to form a four-celled embryo. The simple sporophyte of Riccia consists of a single-layered sterile jacket enclosing sporogenous cells with a very few absorptive nutritive cells (nurse cells).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |