Into how many groups are the Thallophytes divided?

Oogamy with non-motile gametes occurs in $:-$

$A$ - In bryophytes,the gametophyte is dominant and haploid.
$B$ - In pteridophytes,the gametophyte is multicellular,short-lived,and haploid.

Into which group are the non-flowering plants (Cryptogams) divided?

How many orders are contained in the series Calyciflorae?

What is the shape of an apical cell in the gametophytes of bryophytes and pteridophytes?