ISJliiJ Gilkdj: A E< vision of ihe ruhcraJcs of ('alifor)iia 333 



conditions in parts of occasional plants, I have not mentioned the 

 latter in the specific description. 



It will be noticed that the spore measurements indicated in tlie 

 preceding description of Geopora Harknessii do not agree with tliose 

 given by Harkness for Pseudhydnotrya Harknessii (25-28 by 14-18/x), 

 though they correspond closely to those cited for P. carnea (22 by 15). 

 However, careful examination and measurements of the spores failed 

 to reveal any differences in shape and size in the three species of 

 Pseudhydnotrya cited by Harkness. Gardner in a study of Nigros- 

 phaeria Setchellii (1905, p. 178) discovered in this species a similar 

 discrepancy in spore sizes as he found them and as they were indi- 

 cated by Harkness. 



The specimens in the Harkness collection labeled Pseudhydnotrya 

 Harknessii, P. carnea, and P. nigra, are found to differ in minor re- 

 spects, but since such a wide variation exists in a single species, and 

 since representatives of all the forms mentioned above have been dis- 

 covered in one collection, it seems best to unite the three under one 

 specific name. 



]\Iany of the ascocarps of Geopora Harknessii are found to be in- 

 fested with Nigrosphaeria Setchellii (Hk.) Gardner (Gardner, 1905). 

 The perithecia of the latter occur as minute black globose bodies 

 closely dotting the surface of the interior folds of the ascocarps of 

 the host. So far as known, the parasite does not occur upon any other 

 host. The exact relation of the two plants has never been definitely 

 determined, but the parasite apparently does little injury. Except for 

 the few cases previously mentioned of stimulated growth of para- 

 physes about the perithecia of the parasite, no difference can be found 

 in the tissues of infested and non-infested ascocarps of Geopora 

 Harknessii. 



Geopora Cooperi Hk. ( ?) 



Plate 30, fig. 22 



Bull. Cal. .U-ad. Sci., vol. 1. no. 3. p. 168, 18S.5. 



Proc. Cal. Acad. Sei., 3(1 ser., vol. 1, no. 8 (1899), p. 270. 



Ascocarp dark brown, 1.5 em. in diam., somcnvliat lobed ; surface 

 verrucose, clothed with tangk'd, eoai'se, dark brown, septate luiii's; 

 cortex pseudoparenchymatous ; outer cells large with slightly thickened 

 walls; inner cells elongated toward center, changing al)ruptly to 

 hyphal tissue; cavity of aseocar]) dissected by large, loose, mostly 

 easily separable folds and by pi'ojeetions from inner wall into con- 

 nected labyrinthine canals ; pseudoparenciiymatous tissue and hairs of 



