INDEX 



677 



Pollen-chamber, Cordaicarpus, 548 

 Cordaiteae, 553 

 Cycadinocarpus , *549 

 Cycas, * S 43 

 Gnetopsis, 423, 425 

 Lagenostoma, *387, ^389, *390, 



*39i. 392, 393. 400 

 Stephanospermum, 457, ^458 

 Trigonocarpus, 453-456, *454 

 Pollen-grains, 460 



Cordaianthus, 538, 539, 541-545, 



*542 

 Cordaiteae, 553 

 Cycadeoidea dacotensis, 588 



etrusca, 579 

 Cycadinocarpus, 549 

 Lyginodendron oldhamium, 392, 



393. 4°o 

 Stephanospermum, 456-*459, "458 

 Pollen-sacs, 655 



in Cordaianthus, 536, ^537 

 tube, 460, 545 

 Araucaria, 544 

 Microcycas, 544 

 Polypodiaceae, 351 

 Polypodiaceous, 294, 342 

 Polystely, 349, 430, 433, 446, 463, 



497. 643, 649 

 Polystichi (see Psaronius), 297 

 Poroxyleae, 500-514, 518, 525, 529, 

 55°. 55 1 . 554. 652 

 affinities, 513-514, 651 

 Poroxylon, 500, 501-514, 518, 526, 



5 2 9. 535. 554. 65 1 

 branches, 509 

 habit, 501 

 leaves, 507-509 

 phyllotaxis, 501, 502 

 root, 509, 510 

 seed, 512, 513 

 stem, 501-507 

 Boysselii, 501, "503, "507 

 Edwardsii, 501, *503, *505, 506, 



5°9 

 Sutcliffii, 502, 509, "51 1 

 Portlandian or Upper Oolite, 608 

 Pothocites, 70-72 

 Potomac, 557, 609 

 Potonte, H. , 356, 474, 606, 609, 



653 

 Pottsville beds, 465 

 Prepinus, 608, 609 

 Preservation, modes of, 7 

 Primofilices, 345, 346, 347. 638, 639, 



642 



Pro-anthostrobilus, 601 

 Propteridosperms, 642 

 Protandrous, 589 

 Prothallus, Cycadinocarpus, ''549 



Lepidocarpon, *I95, *I96 



Lepidostrobus, 187, *i88 



Mazocarpon, *i88 



Miadesmia, 189 



Stephanospermum, 457 

 Protocalamites, 37, 621 

 Protocorm, 635 

 Protodammara, 607 



fructifications, 607, 656 

 Protopityeae, 494-496, 499 

 Protopitys Buchiana, 494, 495, 496 

 Protostele, 419, 463, 473, 633, 



643 

 Protoxylem, 23, 35, 37, 44, 52, 90, 

 95, 101, 137, 151, 229, 248, 252, 

 254, 302, 310, 315, 328, 329, 

 336, 406, 433, 434, 449, 475, 

 481, 487, 496, 498, 505, 530 

 Psaronius, 288, 307, 346, 349, 463 

 anatomy of, 294-304 

 brasiliensis, 297, *299, 301 

 Renaulti, 301, *302 

 Pseudoaraucaria, fructification, 607 

 Pseudobornia, 620, 625 



ursina, 123-124 

 Pseudoborniales, 86, 123-124, 615, 



616 

 Pseudocycas, 596 

 Psilotaceae, 616, 627 

 affinities, 626-632 

 Psilotales, 616, 631, 632, 641 

 Psiloteae, 126 



Psilotum, 90, 262, 626, 627, 630 

 Pteridophyta, 69, 617, 618, 619 



sporangiophoric, 617 

 Pteridospermeae, 355-473. 494. 499. 

 500, 501, 508, 513, 514, 518, 

 547. 55°. 553. 554. 600, 602, 

 604, 614, 617 

 affinities, 642-653, 654, 656, 660 

 characters, 471-473 

 summary, 471-473 

 Pteridosperms, 268, 272, 346 



fructifications, *28o 

 Pteridotheca, 291 

 Butterworthii, ^292 

 Williamsonii, *293, 294, 347, 639 

 Pterophyllum, 493 

 Pteropsida, 616, 617, 632 



affinities, 638-661 

 Ptychocarpus, 277, *278, 288, 348 



