428 



THAXTER. 



already mentioned more branches may be formed than can be ac- 

 commodated on the surface available, so that all do not necessarily 

 lie flat, and there may be a certain amount of interference. The flat 

 Hchenoid habit, however, is usually characteristic and striking, 

 recalling that of Marchantia or Riccia, and may be very regular. 



Figure 1. Hypocreopsis Rhododendri Thaxter. A, transverse section of a 

 lobe of the stroma. B, Normal ascus with spores partly discrete. C, Portion 

 of ascus enlarged, the spores coherent in two groups. D, Eight firmly coherent 

 spores from single ascus, some septate, others continuous. E, Two groups of 

 three and five spores respectively, the upper continuous, both showing roughen- 

 ing incrustation of surface. F, Three normal spores, given for comparison,, 

 from the specimen of "Hypocrea riccioidea" in Herb. Curtis. 



