July is, 1914 
Influence of Host on Puccinia 
3i7 
the author supposed might occur, but what actually did happen. The 
dates shown above each host indicate the year in which each set of ex¬ 
periments was performed. 
In Table VI are grouped the principal morphological characters of 
each rust under discussion, so arranged that they can be readily com¬ 
pared. 
Table VI .—Morphological characters of Puccinia ellisiana and P. andropogonis 
Stage of growth and 
morphology. 
-Ecia: 
Height. 
Diameter. 
J3dal cavity.... 
Peridia, color... 
P e r i d i a, seg¬ 
ments. 
Peridia. 
JEdospores: 
Shape. 
Markings. 
Size, range. 
Size, average... 
Urediniospores: 
Shape. 
Walls. 
Markings. 
Size, range. 
Size, average... 
Germ pores. 
Teliospores: 
Pedicel length,. 
Size, range. 
Size, average. .. 
Apex. 
Puccinia ellisiana on or 
from Viola. 
Puccinia ellisiana on or 
from Pentstemon. 
Variable, often very long 
(1 to 2 mm.). 
275 to 410/1; average for 10, 
35 o/t. 
no to 165/1; average for 10, 
145^ 
Orange, slowly fading to 
white. 
Irregular, 4 to 10; not 
strongly reflexed. 
Opens tardily. 
Variable, usually very 
short (0.5 mm.). 
335 to 315/1; average for 10, 
2 Soft. 
115 to 150/1; average for 10, 
130/1. 
Pale yellow, quickly fad¬ 
ing to white. 
Irregular, 3 to 6, strongly 
reflexed. 
Opens very soon . 
Subglobose. 
Subglobose. 
Verruculose. 
Verruculose. 
12 to 17 by 16 to 18 (i . 
For 10 spores, 15 by 17/1.... 
Ellipsoid to subglobose.... 
Thick, 3 to 5/1; often 
thicker at apex. 
Verruculose; warts, 15 to 
25 across spore. 
16 to 19 by 21 to 2 3/1. 
Average for 10 spores, 17.5 
by I 9 .S/ 1 * 
4, equatorial.. 
16 to 20 by 18 to 23/1. 
Average for 10 spores, 18 
by 21/1. 
Subglobose to globose. 
Thin, 2/1, uniform. 
Spinulose; spinules, 12 to 
14 across spore. 
20 to 24 by 20.8 to 25.6/1_ 
Average for 10 spores, 22.1 
by 22.88/1. 
4, equatorial... 
16 to 64/1; average for 10 
spores, 46/1. 
16 to 23 by 32 to 45/1. 
Average for 10 spores, 20 
by 38.5/1. 
Thickened, 3 to 8/i. 
16 to 57/i; average for ro 
spores, 39/1- 
16 to 23 by 28 to 35/1. 
Average for 10 spores, 19.8 
by 32.4/1. 
Thickened, 2 to 6 ft . 
Puccinia andropogonis on 
or from Pentstemon. 
Variable, very short (0.5 
mm. or less). 
235 to 315/1; average for 10, 
250 fi. 
125 to 165^; average for 10, 
13 5 /*- 
Pale yellow, quickly fad¬ 
ing to white. 
Irregular, 3 to 5, strongly 
reflexed. 
Opens very soon. 
Subglobose. 
Verruculose. 
17 to 21 by 19 to 24/1. 
Average for 10 spores, 19 by 
22.5^. 
Subglobose to globose. 
Thin, 1.5 to 2 ft, uniform. 
Spinulose; spinules, 10 to 
12 across spore. 
21 to 23 by 22.4 to 25.6/a. 
Average for 10 spores, 22.3 
by 23/1. 
4, equatorial. 
16 to 45/t; average for 10 
spores, 3 5/1. 
16 to 24 by 32 to 40/i. 
Average for 10 spores, 20 by 
35/1. 
Thickened, 2 to 5/1. 
This table shows some very interesting things. For instance, under 
“ JJcia, height,” the characters of Puccinia ellisiana when on Pentstemon 
are practically identical with those of Puccinia andropogonis; under 
“Diameter” the characters are intermediate, but much nearer Puccinia 
andropogonis than Puccinia ellisiana; under ‘'Peridia” a decided change 
is shown in color of peridia, number of segments, and time of opening, 
from the regular Puccinia ellisiana characters to those belonging to 
Puccinia andropogonis. 
Under “iEciospores” the shape and markings of the spores of each 
rust are the same, but in size the aeciospores of Puccinia ellisiana on 
Pentstemon are intermediate between the typical Puccinia ellisiana on 
Viola and Puccinia andropogonis on Pentstemon. 
Under “Urediniospores” all of the fundamental differential characters 
of the urediniospores of Puccinia ellisiana (shape, size, apex, walls, and 
