Tag: classification of bryophytes

In the plant kingdom atracheophytic embryophytes are bryophytes. Thye do not contain vascular tissues and produce embryo in their life cycle.

Dawsonia is a classification of mosses. This genus is a member of the Polytrichaceae family. Dawsonia plants are commonly known to grow taller and have thicker leaves than other common mosses.

Sporogenous cells are those cells, which are capable of undergoing meiotic divisions. These cells combine with each other to form a sporogenous tissue.
Sporogenous cells are endothelial in origin in class Hepaticopsida. In this class the sporogenous cells arise from the endothelium.

An antheridium or antherida is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). In general, the male gametes (antherozoids) are produced in globose structures (antheridia), that are either stalked or sunken in the gametophyte. The antherozoids of Marchantia are long, curved and biflagellate.

• Liverwort is a small flowerless green plant with leaf-like stems or lobes leaves, occurring in moist habitat.
• It lacks true roots and reproduces by means of spores released from capsules.
• The  Golden Mine of Liverworts is the western Himalayas. There are 320 endemic species of liverworts in this region.
• So, the correct answer is 'Westerns Himalayas'.

In Anthoceros, the sporogenous tissue (archesporium) develops from the outer layer of the capsule, which is the amphithecium, surrounding the central columella. In contrast, the sporogenous tissue in Riccia and Marchantia is of endothecial origin.

Elaters are structures present in plants. They are generally present to facilitate spore dispersal (liverworts) but are absent in mosses and spore dispersal is controlled by the peristome.

Marchantia has a dioecious gametophyte. Dioecy is a characteristic of a species, meaning that it has distinct male and female individual organisms or colonies, meaning that a colony contains only either male or female individual. 

Anthoceros is a genus of hornworts in the family Anthocerotaceae. The genus is global in its distribution. Its name means 'flower horn', and refers to the characteristic horn-shaped sporophytes, that all hornworts produce. The dark color of the spores is the easiest way to distinguish Anthoceros.