rous; the large spores measure 350-400 «. in diameter ; 
usually collapsed; smaller, undernourished spores occa- 
sionally present. Shape of the cone elongate, expanding 
from a pedicle 6 mm. wide, gradually to 80 mm. in the 
middle third, continuing until near the apex where it 
tapers suddenly to a rounded summit. 
I have the honor to name this specimen Macrostachya 
Thompsonii in recognition of Mr. TThompson’s continued 
interest in paleobotany and his generosity to the Botan- 
ical Museum of Harvard University. 
Lesquereux believed that Macrostachya infundibuli- 
formis occurs in the Mazon Creek flora. His specimen 
is a poorly preserved Macrostachya Thompsonu. Les- 
quereux’ figured a specimen from Cannelton, Beaver 
County, Pennsylvania as M.infundibuliformis. 1t differs 
from Brongniart’s species but falls within the concept 
of Schimper’. It is probably an unnamed species. Noth- 
ing is known of its internal structure, so that anew name 
would not help the problem. Lesquereux also united with 
Schimper’s M. infundibuliformis, Asterophyllites tuber- 
culata Lesquereux’, and <Asterophyllites aperta Les- 
quereux’. Both of these species are probably valid. 
The most comprehensive discussion of Macrostachya, 
especially M.infundibuliformis is to be found in the mon- 
ograph on Steinkohlen-Calamarien by Weiss’. Figure 1 
on plate VI is frequently copied by paleobotanists (Go- 
than’, Scott’) and is considered to be the ‘‘typical’’ form 
* Lesquereux: Coal Flora, p. 60. pl. 13. f. 17. 1879. 
* Brongniart: Histoire Vég., foss. p. 119. pl. 12. f. 14-16. 1828. 
“Schimper: Paleontologie Végétale, v. 1. p. 333. 1869. 
“Lesquereux: Geol. Penna., p. 852. 1858. 
* Lesquereux: Geol. Penna., p. 852. pl. 1. f. 4. 1858. 
° Weiss: Steink. Calam., p. 71. pl. 6. f. 1-4. 1876. 
"Gothan: Leitfossilien II], p. 117. f. 102. 1923. 
*Scott: Studies, 3rd. Ed., v. 1. p. 65. f. 33. 1920, 
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