78 MISSOURI BOTANICAL GARDEN. 



This species resembles the description of C. microspora 

 E. and E. but differs in the shape of the ascospores, the 

 size, of the perithecia, and the length of the beaks. It has, 

 in addition, a conidial stage, which serves to further set it 

 apart as a new species. On account of the minuteness of 

 its perithecia and spores it is named C. exigua. 



Ceratostomella moniliformis n. sp. 



Another species of Ceratostomella was found by Dr. 

 von Schrenk growing on gum wood in Texas, near Kirby- 

 ville, occurring on Liquidambar Styraciflua. This species 

 stains the wood of gum a brown color, and is the most 

 rapid growing form studied. It is distinct from the other 

 species of Ceratostomella in the form of the conidial 

 clusters, and in the early color of the mycelium. The peri- 

 thecia are covered with short spines, otherwise resembling 

 very much those of Cpilifcra. The name Ceratostomella 

 moniliformis is given to the fungus, with the following 

 cultural characters : — 



Mycelium. 



Cultures of either conidia or ascospores sown in agar 

 plates germinate quickly, and in 24 hours produce the con- 

 idial stage. In two or three da} r s the perithecia are pro- 

 duced. The colony is hyaline at first, but in a few hours 

 begins to turn gray, and finally becomes black. The my- 

 celium is coarsely granular, the filaments measuring 2/x to 

 Six in diameter. 



Conidia. 



The conidia are found on simple or branching, upright 

 hyphae, both in simple moniliform chains and in terminal 

 clusters, the latter resembling the form occurring with 

 some species of Graphium (pi. 5. f. 3, 4, 5). They 

 are formed by the abstriction of the ends of the hyphae, 

 and often fall together as fast as they mature, in rounded 



