40 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 480 



(1969) . Cones and spores from compressions were described by Abbott (1963), 

 Chaloner (1956, 1958), and Wood (1957), and from coal balls by Felix (1954), 

 Balbach (19 62, 1965, 1966a, and 1967), Leisman (1962a, b, 1970), Leisman and 

 Spohn (1962), and Leisman and Stidd (1967). 



Studies of vegetative parts of plants in compressions were carried out by 

 Abbott (1968), while Evers (1951), Felix (1952), and Delevoryas (1957) reported on 

 vegetative parts from coal balls. The underground portion of plants, Stigmaria, 

 was described by Frankenberg and Eggert (1969) and Pfefferkorn (19 72), and com- 

 pression studies of stems and roots were made by Abbott (1968) . 



The herbaceous lycopod, Selaginella { Paurodendron , Selaginellites) has 

 become one of the best known lower vascular plants from compressions and coal 

 balls as a result of studies by Darrah (1938b), Fry (1954), Ho skins and Abbott 

 (1956), Leisman (1961), Phillips and Leisman (1966), and Schlanker and Leisman 

 (1969). 



The vegetative remains of calamites, preserved largely as compressions, 

 were studied by Abbott (1958), and fructifications of calamites were described by 

 Hibbert and Eggert (1965), Abbott (1968), and Kosanke (1955), who also described 

 the anatomy. Coal-ball studies of the vegetative anatomy of calamites were madeby 

 Andrews (1952), Anderson (1954), Andrews and Mahabale (19 61), Andrews and 

 Aga she (1965), Aga she (1964), Melchoir and Hall (19 61), Eggert (1962), Good 

 (1971), and Reed (1952). Cone anatomy, spores, and gametophytes attributed to 

 the calamites were described by Arnold (1958), Baxter (1955, 1962, 1963, 1964, 

 1965), and Leisman and Bucher (19 71), while the data linking calamites and equi- 

 seta were published by Baxter and Leisman (19 67) . 



Sphenophyllum from compressions was reported by Abbott (1958), and its 

 vegetative anatomy was described by Baxter (1948), Reed (1949), Phillips (1959), 

 and Schabilion (1969). Despite the very few vegetative species of Sphenophyllum 

 from petrifactions, several taxa have become known from past and recent studies 

 on Bowmanites by Andrews and Mamay (1951) and Mamay (1959), on Peltastrobus 

 by Baxter (1950) and Leisman and Graves (1964), on Litostrobus by Mamay (1954a), 

 Reed (1956), Leisman (1964a), and Baxter (1967), and on Sphenostvobus by Levittan 

 and Barghoorn (1948). 



One of the major contributions from the Illinois Basin and adjacent areas 

 is the elucidation and description of the smaller ferns assigned historically to the 

 Coenopteridales and other genera. Ankyropteris (Tedelea) glabra is one of the 

 best known as a result of the studies by Baxter (1951b), Andrews (1956), Eggert 

 (1959b, 1963), and Eggert and Taylor (1966). Botryopteris is probably the best 

 known genus from the research by Mamay and Andrews (1950), Delevoryas and 

 Morgan (1954c), Murdy and Andrews (1957), Phillips (1961), Phillips and Andrews 

 (1965), and Phillips and Rosso (1970). Organic connection between Anaohorop- 

 terisand Tubioaulis was established by Hall (1961), and important contributions 

 were made on both Anaehoropteris (Delevoryas and Morgan, 1954a; Phillips and 

 Andrews, 1965) and Tubioaulis (Mamay, 1952; Delevoryas and Morgan, 1952; Eg- 

 gert, 1959a). 



New genera of coenopterid ferns were described as Apotropteris (Morgan 

 and Delevoryas, 1954), Bisoalitheoa (Mamay, 1957; Abbott, 1961; Cridland, 1966; 

 Phillips and Andrews, 1968), Catenopteris (Phillips and Andrews, 1966), Eopterid- 

 angium (Andrews and Agashe, 1963) and Sermaya (Eggert and Delevoryas. 1967). 

 The first American occurrence of Rhabdoxylon was reported by Dennis (19 68b). Re- 

 search on the vegetative anatomy of zygopterid ferns was carried out by Andrews 



