178 



Mycologia 



the infection more slowly. The stems gradually became black- 

 ened, as was also the case in the preceding experiment, the 

 stromata appearing as small pustules near the end of the stem, 

 and gradually spreading down its side. 



Other inoculations were made in a similar way on the petioles 

 of the same and other species of Chamaedorea, and an abundant 

 infection of the conidia followed in nearly every case. All of the 

 culture material was allowed to remain moist, with the hope 

 of producing perithecia. The latter part of April, about two 

 months from the time of the planting of the conidia, perithecia 

 were observed in two of the cultures, being produced in small 

 clusters or occasionally more or less scattered. Perithecia were 

 later seen in one of the cultures belonging to the second set of 

 inoculations. 



Both the perithecia and spores in the culture-grown specimens 

 differed slightly from the original material, but these differences 

 seemed to be due to the fact that the specimens were not properly 

 matured. The perithecia were dull-red in color, while in the 

 original material they were covered with olivaceous granules. 

 The spores, also, were almost destitute of color. However, all 

 of the morphological characters with the exception of the two 

 mentioned above indicate that the species grown in culture is 

 identical with the one from which the inoculations were made. 

 The species may be described as follows : 



Macbridella olivacea sp. nov. 



Stromata erumpent, with a rather compact center, overtopped 

 by numerous branching conidiophores, giving the whole a loose 

 floccose appearance, at first white, becoming pink, about i fx m 

 diameter, scattered or confluent ; conidiophores verticillate- 

 branched ; conidia borne in chains, ellipsoid, 4-5 X 5-6 ix ; peri- 

 thecia occurring in cespitose clusters on or surrounding the stroma, 

 dull-reddish, covered with olivaceous granules, giving the clusters 

 a dark, greenish-black color; asci cylindric, 8-spored; spores 

 i-seriate, with the ends overlapping, fusoid or subelliptic, at first 

 hyaline and surrounded by a transparent envelope, i-septate, be- 

 coming olivaceous or smoky-brown and slightly constricted at 

 the septum, externally marked with coarse striations, giving the 

 surface a roughened appearance, with an oil-drop in each cell, 

 12-15 X8/X. 



