secondary pit-connections (p2)
and cell fusions (cf);
epithallial cells with flattened and flared cell walls.
(reproductive structures: not tetrasporangial conceptacles but “sori” sunken in the thallus
visible only as superficial pores NB: cruciate tetraspores).
Sporolithon ptychoides
cell fusions (cf).
epithallial cells with rounded or
flattened but not flared cell walls.