172 



Mycologia 



septate. They show little evidence of the negative hydrotropism 

 so characteristic of many of our common molds, such as Penicil- 

 lium and Aspergillus. Those developing from hyphae lying in 

 contact with the medium are usually bound down by the water 

 film and develop along its surface. 



The spores are formed by the abstriction of the tip of the sporo- 

 phore. Each is enveloped in mucus, the amount depending upon 

 the moisture of the atmosphere in which it develops. In a dry 

 atmosphere only sufficient is found to cause the spores to stick 

 together in a head. In a moist atmosphere the globule of mucus 

 swells until it completely envelops the spores, and careful observa- 

 tion will show them floating free in the liquid, which sometimes 

 has three to four times the mass of the spores. That this is not 

 merely water but mucus, is demonstrated by the preparation of a 

 mount in alcohol, where the heads remain intact, because the 

 mucus does not dissolve. When water is added, however, the 

 spores are freed by the solution of the mucus and separate. 

 Lindau's characterization of Hyalopns as a Cephalosporin™, grown 

 in a moist atmosphere is justified. The heads vary in size from 

 io to 35 fx and contain from two to numerous spores. The spores 

 are ovoid to cylindric with rounded ends, usually with granules. 

 When the sporophores are short, the spore masses are found upon 

 the surface of the hyphae. The sporophore sometimes produces 

 a head of spores, then, because of some undetermined stimulus, it 

 resumes growth and produces a new head. This may occur sev- 

 eral times and results in masses of spores at intervals along the 

 sporophores. The spores developed on the moist surface of the 

 medium are usually larger than those of the aerial conidiophores. 

 When formed they frequently continue to enlarge after separa- 

 tion from the hyphae and become considerably elongated, even 

 crescent-shaped, and falcate. When grown to several times their 

 original length they become septate, from one to six or eight septa 

 being formed. These spores then bud at one or more points and 

 develop new conidia of a similar size and shape. In this manner 

 large masses of sickle-shaped or allantoid, septate conidia are pro- 

 duced. They remain attached to each other by slender threads. 

 Many of these spore masses in the older portion of the culture are 

 distinctly visible to the naked eye. Rarely they reach a diameter 

 of several millimeters. In some cases the spore mass has a 



