What do you mean by peristome?
Definition of peristome 1 : the fringe of teeth surrounding the orifice of a moss capsule. 2 : the region around the mouth in various invertebrates.
What is the function of peristome?
In mosses, the peristome is a specialized structure in the sporangium that allows for gradual spore discharge, instead of releasing them all at once. Most mosses produce a capsule with a lid (the operculum) which falls off when the spores inside are mature and thus ready to be dispersed.
What is Epicranoid peristome teeth?
What is epicranoid peristome? Ans. In this type, there are two rings of peristome teeth—an inner endostome and outer exostome. The endostome is a more delicate membrane, and its teeth are overlapped by the teeth of the exostome.
In which bryophyte peristome teeth are found in Sporophyte?
Explanation: Peristome teeth are a characteristic feature of Mosses.
What papillae means?
Definition of papilla : a small projecting body part similar to a nipple in form: a : a vascular process of connective tissue extending into and nourishing the root of a hair, feather, or developing tooth — see hair illustration.
How many Teeths are found in peristome?
In the order Polytrichales the peristome consists of 32 or 64 short, pyramidal, solid teeth. Each tooth has a central pillar of fiber-like cells.
What is a peristome in biology?
peristome. / (ˈpɛrɪˌstəʊm) / noun. a fringe of pointed teeth surrounding the opening of a moss capsule. any of various parts surrounding the mouth of invertebrates, such as echinoderms and earthworms, and of protozoans.
What is botany Antheridium?
The male sex organ, the antheridium, is a saclike structure made up of a jacket of sterile cells one cell thick; it encloses many cells, each of which, when mature, produces one sperm. The antheridium is usually attached to the gametophyte by a slender stalk.
Are Elaters present in mosses?
Mosses and hornworts Mosses lack elaters. Within a developing hornwort sporophyte the developing spores are mixed with sterile cells of varying form.
What are Elaters in bryophytes?
Elaters are the ribbon or tube like structures attached to the wall of spore. The elaters function is to increase dispersal because they push the spores out of the plant by absorbing moisture.