Fragments of a stem, leaves, and spo-rangiophores bearing sporangia containing spores, all hitherto undescribed species and all possessing Calamitean characters, were found in coal ball 236 of the Harrisburg, Illinois, collection. The geological age of the material is the Alleghany group of the Upper Pennsylvanian. In its anatomical structure the stem is conformable with the genus Calamites, but varies in detail from any of the described species, and so the specific name multifolia has been assigned to it. Many sections of Calamitean leaves were found, some of them remarkably well preserved. In general they resemble leaves of the Asterophyllites type of the British Coal Measures, yet differ from them in specific details to such an extent that they too have been assigned to C. multifolia. The sporangiophores are all detached from any vegetative structure and are separated from one another, except in one instance where 2 of them were found so related as to suggest an original aggregation into a strobilus. They are unique in the number (25-30) of sporangia they bear. The sporangia are round to angular in section, with a single layer of wall cells, and contain numerous spores. The spores are elliptical to elongate, 25 X 50 [mu], with smooth spore coats and devoid of contents. The fragments described may possibly be vegetative and reproductive portions of the same plant.