8 PLIGHTS, ORCHIDS AND FERNS 



erous.Tather short, simple or occasionally branched, rigid, but variously curved, 

 and interwoven with the mycelium, hyaline or tinted. Asci 16-25, oblong to oval, 

 pedi ill ite. Sporidia 8, or rarely 4. maturing late, often only on the old plants in the 



spring. 



On Poa pratensis and Cinna arundinacea. 



In shady places. Doubtless occurs on other grasses here. No fully 

 developed perithecia were found. 



3. E. OaLKOPSIDIS, I) C. 



Amphigenous. Mycelium abundant, persistent, haustoria of the myceli il 

 threads lobed; perithecia somewhat aggregated; appendages numerous, "short, 

 flexuous, colored, interwoven with the mycelium; asci numerous, often 12 or more; 

 sporidia 2. mostly formed late. 



On Scutellaria lateriflora. 



Found only along the limestone bluffs of the Volga. The perithe- 

 cia are about 100 u in diameter. I don't find this listed for Iowa. 

 Hardly distinguishable from the next. 



4. K. CICHORACEARUM, DC. 



Amphigenous. Mycelium abundant, persistent, haustoria rounded, not lobed; 

 perithecia variable; appendages numerous, mostly short, 1-2 times the diameter of 

 the perithecium, colored, much flexed and interwoven with the mycelium; asci 

 variable, 4 or 5 to as many as 20, mostly numerous; sporidia large, quite uniformly 2. 

 but occasionally varying to 3 or even 4. 



On Ambrosia artemisiaefolia, A. fisilostachva, A. trifida, Aster /crvis, 

 A. sagittifolius, A. sp., Verbena hastata, V. urticcrfolia, V. bracteosa, 

 Cnicus altissimus, Solidago Canadensis, S. serotina, var. gigantea, S. 

 rigida, Helianthus annuus, and Phlox Drummondii. 



The largest perithecia were found on .V. Canadensis, being 120//. 

 The smallest were on P. Drummondii, being about H5 u. 



Uncinula, Lev 



Perithecium containing several asci; appendages free from the mycelium, re- 

 curved or coiled at the tip. 



1. U. NEGATOR, (Schw.) BnrfilL 



Amphigenous or frequently epiphyllous. Perithecia 85-120 //, dark brown, 

 opaque, reticulations small, rather obsmre; appendages from 10 or 12 to 20 or more, 

 varying in length from once and a half to four or more times the diameter of the 

 perithecium, colored for more than half their length, frequently septate, occasionally 

 forked, tips looselv and somewhat spiralU- coiled; asci mostly 4-6 (4-8 Farlow) ovate, 

 pedicellate; sporidia 4-6. 



On cultivated J>7//.rand Vitis cordifolia. 



2. U. macrospora, Feck . 



Amphigenous. Mycelium conspicuous, abundant: perithecia large. 110-165 //, 

 wall tissue soft: reticulations very small, 5-10 u, and rather obscure; appendages 

 very numerous, 50 or more, hyaline, slender, smooth, usually shorter than the 

 diameter of the perithecium. tip closely coiled, not enlarged;" asci several, 8-10; 

 sporidia 2. large. 20 by 30-35 //. 



On Ulmus Americana. 



3. U. Cuntonii, Peck. 



Amphigenous. Mycelium thin, rather persistent; perithecia scattered, 90-120 //, 

 firm, nearly black; appendages 15-30, i-\ l / 2 times the diameter of perithecium in 

 length, hyaline or nearly so, uncinate coiled at the tip; asci 4-6. oval, very short 



d; sporidia 4 -8, mostly 18 21 11 long, completely filling the aBCUS. 

 On /ilia Americana, — rave. 



4. F. CIRCINATA, C. c\l P. 



Hypophyllous. or somet imes amphigenous. Mycelium inconspicuous; perithe- 

 cia very laruc depressed, 150- 225 // in greatest diameter, texture soft, reticulations 



