These organisms are among the first evolutionarily to have xylem and phloem.
This group is susceptible to infection by Chirosia betuleti, which causes Knotting gall. The familysalviniaceae contains small, free-floating examples of this division of organisms, which had a huge radiationin the late Cretaceous period. The indusium is a scaly covering for the sorii of these organisms. This divisionis characterized by a small (*) heart-shaped gametophyte stage called the prothallus. This group, which includesmarattoids, psilotales, leptosporangiates, and horsetails, are more evolved than lycophytes due to having megaphyllson their true leaves. These organisms are among the first evolutionarily to have xylem and phloem. For 10 points,name these seedless vascular plants, whose leaves are called fronds.
This group is susceptible to infection by Chirosia betuleti, which causes Knotting gall.
ferns [or pteridophyta]