258 FLORA OF LOWER COAL MEASURES OF MISSOURI. 



knowu as Artisia, and the leafy branches named Cordaidadus, while the 

 flowers are included in the AnthoUthi or Cordaianthi. Cordaicarpus is referred 

 by Grand 'Emy to this type as the fruit. 



Dorycordaites . — Leaves of variable length, according to age, always 

 lanceolate, much thinner, and less fleshy than in the preceding genus, 

 terminating in a point, and marked by very much crowded, slender, equal, 

 or nearly equal parallel nerves. To this genus Grand* 'Eury^ refers the 

 thin-winged Cardioccnyi, or Samaropsis, and Botryoconus. 



Poacordaites. — Leaves very long, narrow, perhaps as long as 40 cm., 

 while only 1 cm. wide, linear, tapering slightly and obtuse at the summit, 

 rather fleshy, borne on slender branches, the scars being transverse, slightly 

 arched, and much narrower than in Cordaites. The nerves are simple, 

 equal, parallel, all springing from the base of the leaf The fruit of this 

 genus, according to Grand 'Eury, is Taxosperrnum. 



Scutocordaites. — Leaves for a long time persistent on semicircular salient 

 cushions, rounded and contracted at the base, finally divided into numerous 

 narrow, erect, rigid, stringlike strips. Nerves strong and prominent in the 

 lower part of the leaf, separated by fine, parallel striae 



Didyocordaites. — Leaves persistent, long, ribbonlike, probably truncate 

 or uneA^en at the apex, nerves sharp, forking at an acute angle and occasion- 

 ally anastomosing to form linear, acute, somewhat irregular areoles. , Fruc- 

 tification terminal on tlie branches. 



Professor Renault, to whom more than any other we owe our knowledge 

 of the anatomy of the members of this family, has recently given a most 

 excellent summary of this knowledge in his magnificent report on the plants 

 from the Permian basin of Autun and Epinac, in which he includes the 

 results of his late extensive examination of the rich materials from these 

 localities of world-wide fame for the exquisite preservation of their abundant 

 silicified vegetable i-emains. For the detailed account of the internal organ- 

 ization of the pith, wood, bark, root, leaves, inflorescence, pollen, and seeds 

 the reader is referred to his concise and admirable descriptions.- ]\Iany 

 of the details there given are of great interest to the student of recent 

 plants as well as the investigator of the structure of fossil stems. Among 



' G(5ol. et pal. bassiu houill. Gard, p. 314. 



-fitudes desgitea miiiiSraux de la France. Publifes sous les auspices de le Ministre des Travaux. 

 Publics. Bassin liouiller et Permien d'Autun et d'fipinac, fasc. iv, Flore fossile, 2rae partie, par B. 

 Renault. Atlas, 1893 ; text, 1896. See pp. 332-3ri2. 



