Dichotomous branching is found in

Choose the correct option with respect to the given thallus.

Which of the following options correctly identifies the plants and their groups from the following structure?

$A$ : In mosses,the second stage of the gametophyte consists of upright,slender axes bearing spirally arranged leaves.
$R$ : This stage of the gametophyte consists of sex organs.

Who is known as the father of Indian Bryology?

An archegonium of $Riccia$ has: