[MATTHEW] UPPER DEVONIAN PLANTS 115 



EXPLA NA TION OF PL A TES. 



Plate I. 



(The type of Archœopteris hibernica Forbes, is so well known from 

 figures in text books, that it is not given here). 



Figure 1. A. hibernica, var. geniculata n. var. Note the small 

 size of the pedicellate pinnules. Reduced, h diam. 



Figure 2. A. Tschermaki, Stur, (a) Pinna with two fruiting pinnules. 

 (b). Branch of rachis. 



Figure 3. Cyclostigma Kiltorkense Haughton. Megaspore of, with 

 distal part (or awn) attached. Enlarged. Diagrammatic figure, 

 after T. Johnson. 



Plate II. 



Figure 1. Cyclostigma Kiltorkense, Haughton. Reduced \ diam. 

 Stem, showing transverse rows of leaf scars at regular intervals; 

 also of interior cylinder of vascular tissue. Reduced \ diam. 



Figure 2. A younger stem with fewer and more distant scars. 

 Natural size. 



Figure 3. Cyclostigma minuta Haughton. Small with closer rows 

 of scars. (T. Johnson says this is a variety of C. Kiltorkense) 

 Natural size. 



Plate HI. 



Figure 1. Cyclostigma Kiltorkense, Haughton (after Johnson), {a) Aerial 

 part of stem with leaf scars. (6) Parts of stem (supposed to have 

 been below the surface of the ground) still showing some leaf 

 scars, (c) Base of stem showing a few stigmarioid scars. Nat. 

 size. After Johnson. 



Figure 2. Same species. Two fertile sporophylls detached from the 

 cone. See leaf-like distal end. Magnif. After Johnson. 



iTran. Roy. Soc, Can., 3rd Ser. Vol. VI, Sec. IV, p. 83 (1912). 



