[VoL. 5, 1918] 
132 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
mycelial strands are an adaptation to tropical climate for 
dispersal, apparently common to many species of fungi of 
various genera and families. In addition to the specimens 
of C. koleroga and C. Stevensw, cited in the earlier pages of 
this paper, I have seen collections by Mr. J. A. Stevenson, 
6498, 6748, 6748a, on Casearia sylvestris and Hippocratea 
volubilia from Rio Piedras and Bayamon, Porto Rico, which 
show soft, white, mycelial strands running along the stems 
of the host plant to the leaves and not yet fruiting. Dr. F. L. 
Stevens, 7469, on Mayepea domingensis, from Mayaguez 
Mesa, Porto Rico, has a specimen, with fructifications still 
too immature for determination, which has spread by an 
effused mycelium rather than narrow strands for distances 
of three to four feet along the stems and extends out to leaves 
along the way. On the living leaves of Nephrolepsis, in Porto 
Rico, Dr. Stevens has a very interesting collection, No. 4380, 
which has the configuration of a resupinate species of 
Hydnum but has not yet formed basidia and spores. Dr. J. B. 
Rorer has sent to me from Trinidad photographs of the 
mycelial strands of the horse-hair blight on the stems of 
cacao, which seem to be white, cylindric, and compact; he 
notes that their fructification is usually a polypore. 
It is evident that many kinds of fungi in the tropics have 
the curious ‘‘thread blight’’ habit of growth. One so for- 
tunately placed as to be able to collect such fungi where grow- 
ing could make sure that the fructifications were mature and 
of value for taxonomic study by making a spore collection on 
a glass microscope slide from the fresh specimen. 
