2 A. C. Whit ford 



or pyriform. From .0102 to .0119 mm. long and from .0051 to 

 .0068 mm. wide. Smooth, brown, divided into two parts by a 

 septum, the upper round, and the other roundish-pyriform. The 

 filaments of the mycelium are septate and ramifying, and at these 

 places are protuberances upon which the conidia are formed. No 

 conidiophores are known." This plant was found in the Eocene of 

 Austria in a specimen oi Helitoxylonroemeri. The description of 

 the above shows it to be similar in the main features to the one 

 under consideration. The differences may be noted from the 

 following description : 



Cladosporites ligni-perditor, sp. nov. 



Hypha. — Septate branched, some of the branches smaller. 

 Color, clear brown. The upper ends, where the conidiophores are 

 attached, are swollen. The cells of the smaller hypha are .023 to 

 .029 mm. long and from .021 to .023 mm. wide. The larger 

 hyphal cells are from .0044 to .0046 mm. wide and from .03 to 

 .046 mm. in length. See Plate I, figs, i and 2. 



Conidiophores. — Septate nodulose, and of a clear brown color. 

 These are common and serve as a mark of distinction, or else the 

 specimen under consideration is a more complete plant than that 

 described by Dr. Felix. See Plate I, figs. 3 and 4. 



Spores. — Two kinds. First, one-celled. These are globose or 

 elliptical, smooth, of a light brown color, and grow in chains. 

 Length .0046 to .0115 mm. and width from .0023 to .0069 mm. 

 See Plate II, figs, i, 2 and 3. Second, two-celled spores. Divided 

 near the middle by a septum, upper part globose, lower triangular 

 to triangular-globose. Smooth and clear brown. These were not 

 found in chains. Length from .0161 to .0253 mm. and breadth 

 from .0069 to .0115 mm. See Plate II, figs. 5, 6 and 7. In the 

 modern genus, the one-celled spores are formed by a breaking up 

 of the two-celled. This may perhaps be found in the fossil species, 

 as shown in Plate II, fig. 4a, h, and c, which seems to show pro- 

 gressive stages of division. 



182 



