Each peristome is a ring of triangular "teeth" formed from the remnants of dead cells with thickened cell walls. There are usually 16 such teeth in a single peristome, separate from each other and able to both fold in to cover the stoma as well as fold back to open the stoma.

Apr 2, 2017 · It then describes the different types of peristome teeth structures found across moss species, including orthodontous and nematodontous types. The document outlines the key characteristics and classifications of different peristome structures such as diplolepidous and haplolepidous types.

Peristome teeth represent an important evolutionary adaptation in bryophytes that enhances their ability to reproduce successfully on land. By providing control over spore dispersal, these structures allow mosses to optimize their reproductive …

Jun 25, 2024 · Most of the mosses contain teeth-like projections in their capsule which are called peristome teeth. The apophysis region is responsible for photosynthesis.

Jul 25, 2024 · Description: Consists of two rings of peristome teeth: an inner endostome and an outer exostome. Endostome: A delicate membrane with teeth aligned between the teeth of the exostome. Exostome: The outer ring of teeth, generally sturdier.

The Peristome. In the majority of stegocarpous mosses, spore dispersal is mediated by the peristome, a circular system of teeth that is inserted on the mouth of the urn, to the inside of the operculum. The developmental history and architecture of the peristome provide a suite of important systematic characters (Fig. 5).

May 21, 2018 · peristome A single or double ring of setae (teeth) which fringes the mouth in many types of moss capsule; the peristome can be seen when the lid of a ripe capsule falls or is removed. The setae are hygroscopic (absorb moisture from the air).

Mar 1, 2007 · Peristome characteristics distinguish three main lineages of arthrodontous mosses, Bryales (plus Hypnales), Funariales, and Dicranales (Buck and Goffinet, 2000, Fig. 1C–E). These features include the arrangement of the outer ring of teeth (exostome) in relation to the inner ring of segments (endostome), whether both rings or only the ...

the morphology of the peristome teeth, yet little information exists on development of peristomes. In this paper we describe the sequences of cell divisions leading to peristome formation in six species of mosses representing two families with haplolepideous peristome structure. The …

Morphological features that define the family include lateral inflorescences on rather highly branched plants, sharply toothed leaves that are often bistratose along the margins, and rounded-hexagonal leaf cells generally having thickened walls. Most species are distributed in the Southern Hemisphere in. moist tropical or subtropical forests.