Cyathotrachus bulbaceus R.Graham

Plant Fossil Names Registry Number: PFN000280


Author: R. Graham

Rank: species

Reference: Graham, R. (1934): Pennsylvanian flora of Illinois as revealed in coal balls. I. – Botanical Gazette 95(3): 453–476., link

Page of description: 459

Illustrations or figures: figs 13–15, pl. 8, figs 28. 29

Name is type for

Other combinations

Original diagnosis/description

Sporangia four to six, attached basi-laterally to a short central column, their bases completely united to form a saucer-shaped receptacle. The sporangia are united laterally for the greater part of their length by a common wall, a deep cup being left at the summit of the synangium. Synangia pedicellate and bulblike in shape, measuring about 0.65 mm. in diameter. Spores are 18 μ in diameter.


Carboniferous, Pennsylvanian
The geologic horizon from which these petrifactions were obtained is about Middle Conemaugh in age, and is near the top of the Pennsylvanian strata found in Illinois.

Upper Pennsylvanien according to Millay (1977: Amer. J. Bot., 64(2): 223).


United States
Calhoun coal mine, Richland County, Illinois

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


Use comments to notify PFNR administrators of mistakes or incomplete information relevant to this record.