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What are the main representatives of the pteridophytes? Is this plant group cryptogamic or fanerogamic?

The better known pteridophytes are the ferns and the maidenhairs, from the filicinae (filicopsida) group, and the selaginellas, mosslike plants from the lycopodineae group (lycopsida). Pteridophytes are cryptogamic plants, i.e., they are flowerless and seedless.

How different are pteridophytes from bryophytes regarding substance transport?

Pteridophytes are tracheophyte (vascular) plants, i.e., they have tissues specialized in conduction of water and nutrients. Bryophytes are nonvascular plants. In pteridophytes therefore the substance transport is done through vessels and in bryophytes that transport occurs by diffusion.

Why do pteridophytes are better adapted to dry land than bryophytes? Were pteridophytes always less abundant than phanerogamic plants?

Although bryophytes and pteridophytes have water-dependant gametes for fecundation the emergence of conductive vessels in this last group facilitated the life on terrestrial environment.  The conductive vessels of the pteridophytes collect water from the moist soil and distribute it to the cells. Bryophytes do not have such option and they depend entirely on the water that reaches the aerial part of the plant and so they need to live in humid or rainy places.

Before the ascension of the phanerogamic (plants that present seeds) the pteridophytes were the plants that predominated on the terrestrial environment. The large pteridophyte forests of the Carboniferous period (named after the pteridophytes) are responsible for the formation of coal deposits, mainly in Europe, Asia and North America; the Carboniferous period is situated about 360 and 290 millions of years ago and it is part of the Paleozoic era.