All^ll^.t— Si--|)UiiilHr 1SS4.] 



PSYCHE. 



197 



the cnlartjenifiit occurs so luiifonnh 

 in all parts that neither the midrib nor 

 lateral nerves are obliterated. Now 

 and then spots of the same nature are 

 seen on the stem, where thev are more 

 irregular than on the leaf, and common- 

 1\' occup\ somewhat swollen portions 

 cif the internotles. The surface of the 

 sp )t is of a dead coal-black, occasion- 

 alh' slitihtlv i;loss\' on the nerves. Some- 

 times the black passes into a deep pmple 

 at the edge of the spot, due to the pres- 

 ence of a soluble pig'ment in the diseased 

 epitlermal cells, this color chauLjing' 

 graduallv into the green of the surroiuid- 

 ing leaf. In other cases it is bordered 

 b\ a narrow white ring, forjiiing a sharp 

 line of demarcation between the black 

 on the one hand and the green on the 

 other, or more rareh separating the 

 black from a purple zone, which grad- 

 nalK passes into the green. 



On broader leaved .species, like Soli- 

 diii^'ii iiliiii folia and S. caesia^ the spots 

 aie mure tVet|uentl\ roiuul or slightlv 

 irregular, extending without interrup- 

 tion ii\ei' the smaller veins or e\en the 

 midrib. Thougii often glistening, the\- 

 usualK lack the coal-black appearance 

 noticeable on S. laiircolata. and the rea- 

 son for this is in some instances detected 

 in a \ei\ delicate, whitish membrane, 

 cleaih continuous with the wliite or 

 \ el low border, w hich covers and modifies 

 to a grealer or less degree the lilack of 

 the underKing parts. While some of 

 ihe spots are no thicker than the unaf- 

 t'ected portions of the leaf, others are 

 strongh' C(ni\exon one or lioth sides. 



It h:is been suid that .Schweinit/, called 

 these fungi, and two species wei i- mad<- 



of them, characterized by their external 

 features as follows : — 



2034. Rhytisma soiidaginis, L. v. S., vulgatissiinum 

 in (bliis vigentilius .Soliduginis lanceolatae nee .itibi. . . 

 R. innatuni, aterrimuni, alisque ullo vein aut nitore, orbi- 

 culatiim aut ovatuni, niargine lute" in folio; in pagina 

 superiori convexuni, in inferiori concavum ; diametro 

 1-6 lincarnni. Saepe phira confluunt — sed apertum non 

 villi. 



2035. ■^- l^ijyoii!^, L. V. .S., ravum in folio Solidaginis 

 sempervirenti.s. . . R. innatum, aniptiigennni, orbicula- 

 turn, gregarium aut subconfluens, convexum in ambabus 

 paginis et satis crassum, margine in folio exalbescente. 

 Sursum indutum cortice aut veto crassiore fusco-grisea 

 fxterinri, demum frustulis soluto, cortice interiori atra, 

 intus carbonaceuni. Diametro trilineari. Interdum 

 perforatum invenitur, an casu? — ceterum inapertum. — 

 Sclizvf'iniiz, Synopsis fung. Amer. bor. (Trans. Amer. 

 pliilos. soc, iS.^i, n. s.,v, 4, p. 341.) 



The spots on Asfcr leaves resemble 

 those on the broad leaved species of kSo/- 

 /i/as^o in their general appearance, and 

 var\ e\en on the same plant from plane 

 to strongly piano- or bi-convex. The\' 

 are either entirely marginless or with a 

 while or vellow border from 0.2-3 mm. 

 in wi<lth. Occasionallv the border is 

 more or less tinged with red ; this is 

 especialU the case where it is very 

 broad. .As with some specimens of the 

 preceding species, the degree of con\-ex- 

 it\ increases with age, the central portion 

 of some spots being nearly hemispheri- 

 cal, Schweinitz at first referred this 

 to the t'migus genus Xv/oma. but after- 

 ward trairsterred it to R/ivfis»m. and 

 characterized it as toUow s : — 



271. Xvloi'ift usti^ris S/,. X. minus nblonguni ten. 

 viius snbetliguratnni rugo.suin nigrum opacuni, ambitu 

 sHo folium decoloraiis. In foliis vigentibus Asteris 

 liadcscanti ct atioruui rarissime. Initio et ipsum veto 

 tcnuissinio cincreo sul>lectinn, rugosuin, absque splen- 

 doyr.— Si/n'-ritlifz, Syn. fung. Carol. Super., (1S22), 

 I'- .XV 



2ox\- /i/iyf'sittii (tsft'ris L. V. S., Syn. Car. 271, passim 

 in foliis variorum .\sterum . . Species quam distincta. 

 K. innatum cxacte orbiculatum, margine latiusculo exal- 

 liesccnte, ambitu lobato, amphigenuni, atrum sed expers 

 nitoris. teniuscniuin, ininetulatum : diametro bilineari, 

 nrinnun vflo tenni^simo rinerco tectum denium evanes- 



