labelled diagram of Sporophyte of Moss

labelled diagram of Sporophyte of Moss

Sporophyte of Semibarbula or Moss: Zygote is the first cell of the sporophyte. The zygote (2n) divides, develops and eventually produces a sporophyte, called sporogonium. This sporogonium has three parts.

(I) Foot

(II) Seta &

(III) Capsule

Foot: The lower part of seta which keeps the sporophyte attached with gametophyte is called foot.

Function: Sporophyte absorbs food and water from garnetophore through foot.

Seta: It is a long, soft and slender part of sporohyte that bears the capsule at its tip.

Function: Conducts food for capsule

Capsule: The following parts are found in the longitudinal section of moss capsule.

i) Apophyses, ii) Capsule wall, iii) Air cavity, iv) Sporangium, v) Columella, vi) Operculum, vii) Annulus & viii) Peristome.

(i) Apophyses: The swollen part at the attachment of capsule and seta is called apophyses. Its surrounding area is composed of parenchyma cells and well fitted with stomata.

(ii) Capsule wall:  It is composed of multilayered sterile cells enriched with chloroplasts.

(iii) Air cavity: The cavities present to between capsule wall and sporangium are known as air cavities the walls remaining in the air cavities are called trabeculae.

(iv) Sporangium: Sporangium is made by one to many celled layers Spore mother cells are formed from this sporangium

(v) Columella: It is the sterile region situated at the centre of the capsule

(vi) Operculum: Situated at the tip of the capsule and it acts as a lid covering the peristome. It is composed of a multi layered parenchyma cells.

(vii) Annulus: It is a band Re tissue which is the connecting link between the operculum and the opening of capsule When the capsule attains maturity, annulus breaks down and the spores come out.

(viii) Peristome: Some tooth like structure situated at the top of the columella is the peristome It is hygroscopic in nature and it regulates the dispersal of spores.

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