PAPERS OX BOTAXY 179 



described in the Sylloge; the first number being that of 

 the volume, the second that of the species in that vohune. 

 For instance, 3-110 refers to Septoria species 110 in vol- 

 ume 3 of the Sylloge. The second column presents the 

 diameter of the pycnidia in microns. The third column 

 gives the spore length, also in microns. This column is 

 the key to the whole table, the "species" having been 

 arranged first according to the minimmn measurement, 

 secondly according to the maximmn. The fourth column 

 gives the spore diameter in microns. In 5 and 6 the sep- 

 ta and guttulae, if present, are checked, if absent from 

 the description the fact is indicated by a dash. If a 

 definite number is present, figures giving the number 

 of septa or guttulae are entered in the colimm. The 

 sign X) means that the spores are multiseptate or guttu- 

 late. Continuous or entire spores are so indicated when 

 the character is present in the description. Columns 

 7 and S representing curvature of the spore need no com- 

 ment. The number in column 9 representing spore color 

 correspond to the numbers given by Saccardo to different 

 colors in his "'Chromataxia." "A" here denotes hyalin 

 spores. The significance of the remaining figures in this 

 column may be determined by use of the following table : 



A — Achrous hyalin 



2 — Griseous gray (smoky, cloudy.) 



4 — Ater dark, blackish 



22 — Luteus egg-yellow, golden-yellow 



23 — Flavus yellow 



30 — Melleus stone-colored, amber-colored 



35 — Viridls green 



39 — Olivaceous olive green 



Column 10 represents spore shape, the numbers corre- 

 sponding to those found in the following list : 



1 — Linear, filiform, vermiform, flagelliform or acicular. 



3 — Oblong, cylindrical, bacillar, rod-shaped, allantoid or terete. 



4 — Fusoid or fusiform. 



6 — Clavate. 



7 — Irregular. 



Column 11 is merely a list of the genera of hosts. Col- 

 umn 12 represents the families of hosts. The figures 



