78 



Kansas Academy of science. 



On Echinospermuni Redowskii Lehm., var. cupulaium Gr. 

 E. Bartholomew No. 320, June 5, 1889, Rooks county. 



Peronospora Cynoglossi Burrill is readily distinguished from P. Myosotidis De 

 Bary and P. Asjjeruginis Schroeter, both of which occur on Boragineae, by the oospores 

 having a smooth epispore, and the wall of the oogonium being thick. P. Myosotidis 

 De Bary is said to have the epispore marked with reticulate ridges, and P. Asper- 

 uginis Schroeter has a warty epispore. The conidiophores of P. Cynoglossi Burrill, 

 in N. A. F., 220B, (on Cynoglossum Virginicum, Tunnel Hill, Ills., May, 1882, A. B. 

 Seymour,) are more rigid; the conidia are more violet and more clearly papillate 

 than P. Myosotidis De Bary, in F. Eu. No. 572, (in Myosotidis intermediae foliis, 

 Friburgi Brisgavorum, Aprilli, 1862, leg. De Bary.) 



The Kansas specimen on Echinospernwm, collected by Mr. E. Bartholomew, I have 

 called P. Cynoglossi Burrill, var. (?) Echinospermi Swingle. This form may very 

 likely prove to be new, but as no oospores have been found, the question cannot 

 now be settled. Dr. Burrill (in letter) thinks the Kansas specimens are a form of 

 his P. Cynoglossi. The conidiophores are, however, much less branched and more 

 rigid; the conidia much larger and not papillate, though not much different in color. 

 It is to be hoped that oospores of this interesting form can be found. Measure- 

 ments of this form are given below : 



MEASUREMENTS OF PERONOSPORA CYNOGLOSSI BVRmLJ., VAR. (?) ECHINOSPERMI 

 SWINGLE, ALL GIVEN IN ^'s. 



100 Conidia.* 



25 x24 

 25 x24 

 25 x24 

 25 x24 



25 x25 



26 x20 

 26 x21 



26 x22+ 

 26ix26 



27 x21 

 27 x22 

 27 x22+ 

 27 x23 

 27 x23 

 27 x23 

 27 x23 

 27 x23 

 27 x23 

 27 x24 

 27 x24 



27 x24i 

 27ix22j 

 2lH22i 



28 xlB 

 28 x2H 



30 x28 



31 x23 

 31 x23 

 31 x23 

 31 x23i 

 31 x24 

 31 x25 

 31 x25 

 31 x26 



31 x26 



32 x23| 

 32 x24 

 32 x24 

 32 x25 

 32 x25 

 32 x26 



32 x28 

 32*x23 



33 x26i 



33 x27 

 33jx20 

 33ix30 



34 x26 

 34 x27 

 34 x27i 



25 Conidiophores.! 



Total 

 height. 



240 

 255 

 261 

 270 

 270 

 276 

 294 

 300 

 306 

 315 

 321 

 324 

 327 

 336 

 348 

 360 

 360 

 366 

 370 

 376 

 378 

 390 

 399 

 400 

 414 



Length 



of itn- 



branched 



basal 



portion. 



174 

 183 

 195 

 210 

 219 

 195 

 225 

 225 

 252 

 201 

 234 

 240 

 243 

 261 

 270 

 243 

 282 

 270 

 279 

 273 

 270 

 310 

 330 

 333 

 324 



Length 

 of first 

 branch. 



36 



74 

 66 

 54 

 45 

 78 

 48 

 38 

 69 

 49 

 68 

 78 

 54 

 60 

 60 

 87 

 42 

 75 

 87 

 81 

 62 

 76 

 61 

 81 

 57 



Number of 



times 

 branched. | 



3-4 

 4-5 



4 

 4-5 

 3-4 



4 

 3-4 

 3-4 

 2-5 

 4-5 



4 

 4-5 

 3-5 



4 

 3-5 

 5-6 

 3-5 

 4-5 

 4-5 

 5-6 

 4-5 



5 

 4-5 

 4-5 

 4-5 



Diam- 

 eter at 

 base. 



9 



IH 

 8i 



10 



10 

 9 

 9 



11 



Hi 



lOi 



H 

 101 

 10 



8i 

 lOi 



8 



81 

 12 



9 



9 

 12 



9 



9i 



9i 

 Hi 



♦Measured from dried specimens moistened with dilute Potassium hydrate, with eyepiece micro- 

 meter having divisions of a vakie of l/u.. -f-Measured from same slide as the conidia, with an eyepiece 

 micrometer having divisions of a value of 3/i. t When two figures are given in this column, the first 

 gives the number of bifurcations found by counting up the first branch of the conidiophore, and the 

 second the number obtained by counting up the main stem of the conidiophore to the extreme tip. 

 Rarely the number of branches was the same in both, and then only one number is given. 



