﻿DESCRIPTION OF PLATES. 263 



Photograph i.—Cycadeoidea Wielandi (T. 131). Bears (like 77, photograph 6) numer- 

 ous ovulate cones and scars from which such have been shed. (Cf. plate xxn.) 



Photograph 2.—Cycadeoidea McBridei (T. 8). Basal view of a trunk bearing ovulate 

 fruits much like those of Bennettites Gibsonianus, B. Morierei, and C. Wielandi. Though 

 not quite so large, the characteristic leaf-base spirals in form and habit much resemble those 

 of Cycadcoidea megalophylla, to which the present is deemed a closely related species. 



Photograph 3.—Q, nana (type) (T. 84). Supposed to be a pygmic species. There are 

 one or two very minute or young lateral fruits or buds tc be noted on the specimen, which, 

 however, affords a clear example of the pulcherrima stage of growth. The leaf-base spirals 

 are correspondingly symmetrical. 



Photograph 4.—C. Stilwelli (T. 105). The type. A trunk bearing a few lateral fructi- 

 fications or buds, and notable alike for a near approach to the existing cycads in the regu- 

 larity of its leaf-base spirals, the even shearing of the armor by periderm, and the very 

 slight development of ramentum. 



Photograph 5.— C. formosa (T. 89). The type specimen, inverted to better show the 

 leaf-base spirals of the basal region, the base itself being shown in photograph 2, plate xiv. 

 Like the preceding specimen this trunk is notable for the symmetry and even shearing of 

 its leaf-base spirals, strongly recalling the regularity of these features in the existing 

 Australian Macrozamias, especially such as are without scale leaves. The rather broad 

 spaces between the leaf-base ends are, however, densely packed with fine, hairy, scale-like 

 ramentum, and a few young fruits appear. Their growth and maturity would have marked 

 the close of the pulcherrima stage so beautifully illustrated by this specimen. 



Photograph 6.—C. Wielandi (T. 77). Type of the species. A finely preserved stem 

 which bears laterally between its leaf bases about 50 ovulate cones and scars left by the 

 dehiscence or perhaps crushing away of cones during the process of erosion from matrix. 

 The stage of seed (or gamete) growth has not yet been determined, further sections being 

 required. A cone from this specimen is shown in longitudinal section, plate xxni, photo- 

 graph 2, and in transverse section, plate xxvi, photograph 2. This cone was the first from 

 an American cycadeoidean plant to be cut and studied structurally. The seed interiors are 

 not conserved in any of the cones thus far cut from the present trunk. 



Photographs 7 and g.—C. Marshiana (T. 161 and 164). Top and bottom views of the 

 first of the symmetrically branched specimens added to the Yale collection. The remainder 

 of the wonderfully handsome specimen No. 161, photograph 7, has never been obtained. All 

 the quite similar specimen 164 was secured by the writer as related in Chapter II. The 

 trunk as thus completed is shown on plates VII and vni following. 



Photograph 8.— C. dacotensis (T. 54). A globular form of trunk bearing several incip- 

 ient branches. (See photograph 2. plate v.) 



Photograph 9. — See legend of photograph 7. 



Photograph 10.— C. minnekahtensis (T. 212). A slightly more columnar trunk than 

 the preceding, bearing two large lateral branches, but one of which appears in the present 

 view. This trunk has advanced beyond its pulcherrima stage, and is Hearing a culminant 

 period of fructification. Its fruits have not been studied in detail, but are clearly young, 

 it being of special interest that those borne on the branches and in larger number on the 

 main trunk over all its surface are all about equally advanced in growth. 



Photograph 11.— C. colossalis (T. 10). From a clump of huge branches. A robust 

 trunk or huge branch bearing several partly emergent and a large crown of non-emergent 

 young fronds, as well as smaller lateral branches and fruits. Traces of the original sym- 

 metry of the leaf-base spirals are still evident. The fruits appear to be young and small, 

 though not yet studied in detail. 



Photograph 12.— Cycadcoidea dacotensis (T. 214). A cycad trunk (evidently from a 

 large branching trunk or clump as in the preceding instance) in culminant fructification. 

 More than 40 strobili are present, 16 of which have been studied in detail, as related in 

 Chapter VIII. For figures of sections from these strobili see plates xxxiv-xlii. 



