In the developmental anatomy of the moss capsule, the endothecium undergoes specific divisions. The innermost layer of the endothecium is often referred to as the first ring of cells in the context of its developmental sequence. This layer is significant as it contributes to the formation of the columella or other internal structures within the sporangium.

The stem of Polytrichum is anatomically complex for a bryophyte. It is differentiated into three distinct regions: the epidermis (outer layer), the cortex (middle region), and the central conducting strand (hydrome and leptome), which facilitates water and nutrient transport.

The archegonium is the female reproductive organ in bryophytes. It consists of a swollen base called the venter and a neck. Inside the venter, there is a large egg cell (oosphere) and a smaller cell positioned directly above it, known as the venter canal cell. During maturation, these cells typically degenerate to facilitate the entry of sperm.

Funaria, commonly known as the cord moss, is a terrestrial bryophyte. It typically grows in moist, shady areas, on soil, or on burnt ground, but it is not an aquatic plant, although it requires moisture for the process of fertilization.

In the sporophyte of many bryophytes, the sporangium is differentiated into a foot, seta, and capsule. The capsule is the terminal, upper portion of the sporangium where spores are produced. This structure is essential for the protection and eventual release of spores into the environment.

In monoecious or dioecious mosses, the specific branch or gametophore that produces the male reproductive organs, known as antheridia, is referred to as the male branch or antheridial branch. These are often distinguished by a cluster of specialized leaves called the perichaetium or perigonium.

A thallus is a plant body that is not differentiated into true roots, stems, and leaves. In many primitive plants like bryophytes and certain algae, the gametophyte generation represents the dominant, independent, and often thalloid phase of the life cycle, lacking complex vascular tissue differentiation.

Fertilization in mosses like Funaria is dependent on water. The archegonium releases chemical substances, such as sucrose or proteins, which create a chemical gradient. The biflagellated sperm cells exhibit chemotaxis, moving toward the archegonium in response to these chemical signals present in the water film.

During the differentiation of the capsule, the endothecium undergoes specific divisions. In many mosses, the endothecium is organized into four distinct cell layers that eventually differentiate into the columella and the spore sac.

Peristome teeth are described as hygroscopic, meaning they are sensitive to moisture levels in the surrounding atmosphere. When the air is dry, the teeth bend outward, allowing spores to escape from the capsule. Conversely, in high humidity, they absorb water and close the capsule opening. This movement is a passive mechanical response that optimizes spore dispersal timing.