21 



', OVllf<'. 

 i/V/r,s, S. 



S, JK'fio- 

 hit, I, P. 



ndlcciii)*. 



(Plate 3> 



rroin the 



I 



or sciuil 



,v, iir-ually 



■i than, to 



)!• .') to 20 



y 3 or 4, 



eiift, Acer 



C. foiiien- 



.s- C'/iios- 



iihcscciis, 



ifcra, 0. 

 hi jxipij- 

 ini, Conj- 

 Queiriis 

 rfon'o, Q. 

 a, Ti/pha 



ions ill tlie 



size of tlic pcritliccin. tlio Iciiiith of tlio a|)i)(Mi(liiircs. tlio luimlior iiixl 

 siz(! ol' ilio iisci, and the size ol' tlic sjioridia : tint none of tii<'se I'oriiis 

 seem constniit eiioiidi to .instily tlicii' separation. On Lh-UnhnnU-on 

 the mycelium is usually ineonspicuous, tin' a|ipen(la<i'es l)ut little longer 

 tlian tlie diameter ol" the perithecium. and the lew (.'<-l(») asei are 

 hiru'e and liroadly ovat<'. On Uhtnts the niyeelium is almndant and 

 itersistent, the ])eritheeia and ajiixMidaues medium, and the very 

 inniicious (20-;>()) asei are small and narrow. On Qucrnis the j)ei-i- 

 tliceia ai'c verv lariic, and tlic lO-lo asei and the sporidia ai'e mueh 

 larsi'er than oii [.'hniis. On Cori/ln.^ the jieritheeia are small, hut tin- 

 apjicndaiies arc very lonu'. It is rcniarkaltlc lor the execcdinu'Iy u'reat 

 diversitv ol' the host spceies which it alVects. Scarcely a deciduous 

 leafed tree seems to he ]»roof au'ainst \t. 'J'he most pecnliai' thinu' in 

 this connection is its a]t]iearancc on Ti/p/ia latifolia (Anderson. Journ. 

 My col. V. )». 1'.)^). 



In a larii'c nundier of instances the ]ierithecia have a dense layer 

 of short, branched, line. Iiyaline, radiatinu' hyi)li!V, totally distinct from 

 the conspicuously liull»ous a|i|)endau'es. There are projections from 

 the wall of the perithecium, issuing frcjm the lower side and formiiej.' a 

 cushion-like mass. 



PODOSPH.^^^RA, Kiiiize. 



Mycol. HcfU- II, p. III. 



Perithecium c(jntaininij,' a sinjrle ascus. Appendages free from the 

 mycelium, dichotomously Itranchcd at the end. 



P. Oxyiuantlias (DC.) (Plate 4) 



ICiysit>lii- il.iyaianthcc, UC. I'lore Frauc. VI, p. io6. 



Alf'hiliomnflux iluiiiiisliiui. Wallr. Flora Crypt. Germ. Ill, p. 753. 



Jiiysibi' cltimli-slhm, Lk. Spec. Plant. VI, I, p. 103. 



I'lHiiifpluFHi h'linzii, ilandislina, I.iv. Ann. Sci. Nat. Scr. Ill, Tonic XV, p. 19. 



J'odosphtsia initio), Howe, Torr. Hull. V, p. 3. 



Miciospluoa fiilvo-fiilciii, Cke. Grev. VI, p. no. 



i'odos/tlucia O.iyaiaiilliic, Dlly. Morpli. und Pliy.s. der Pjlze, III, p. 4S0. 



Amphigenous. Mycelium variable, often abundant, jjcrsistent. 

 Perithecia (io-llO //, dark, ojtake, reticulations regular, a 1 tout 10-i.i •. 

 evidiMit when young, scarcely observable when old, except by the un- 

 even surface; aj)pendages 8-20, dark brown for more than half their 

 length, frc(|uently septate, 1-4 times as long as the diameter of the 

 perithecium, 3-5 times dichotomously forked, branches short, often 

 swollen. tii)s recurved. Ascus lu-oadly elliptical or orbicular, about 

 .oOxfiO n, thick walled. Sporidia u.sually 8. 



On Priiiiifs domesfica, P. Amoicana, P. Cerasiis, P. pnmila, 

 P. Virgiiiiana. P. (h'liiissa, Spinca salfcifolkt, S. fomenfosa, S. 

 DoiKjhmi var. dnmom, Pyriis M(dns, Crata'f/us Oxyacantha, C. 

 (•occinea, C. totncutosa, C. punotnta, C. cnis-gidli, Amelayichier 

 Canadensis, Diospyms Virginiana. 



