(Vol. 12 

 216 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



2. Hymenium colored and the subhymenium also in a few species. 

 •Closely adnate, not separable. 



a. Cystidia not incrusted. 



fFructification not stratose 28-SO 



ffFructification becoming stratose SI, SS 



b. Cystidia incrusted S3-S8 



**At least small pieces separable when moistened. 



a. Cystidia incrusted. 



fHyphae incrusted 39-44 



tfHyphae not incrusted or not obviously incrusted 45-62 



b. Cystidia not incrusted. 



fHyphae incrusted 63-56 



tfHyphae not incrusted or not obviously incrusted .... 57-61 



II. Substance not colored almost without exception, cystidia very 



long, cyUndric, thick-walled, not normally incrusted, often visible 

 through whole thickness of the fructification, no gloeocystidia — the 

 P. glebulosa group 62-68 



III. Substance not colored, gloeocystidia present as well as cystidia — the 



gloeocystidial group. 



1. At least small pieces separable when moistened. 



*Cystidia incrusted. 



f Some cystidia 40-100 X 20-50 V- 69 



ff Cystidia of the usual size 70-79 



♦♦Cystidia not incrusted 80-85 



2. Closely adnate, not separable 84~90, 111 



IV. Substance yellow or yellowish rather than dark-colored and often 



bleached by potassium hydrate solution. 



1. At least small pieces separable when moistened 91-97 



2. Closely adnate, not separable 98-100 



V. Substance more or less dark-colored, the dark color retained in pre- 



parations stained with eosin. Gloeocystidia sometimes present. 



1. Fructification stratose 101-102 



2. Fructification not stratose. 



*At least small pieces separable when moistened. Compare also 



resupinate Stereum ferreum 103-110 



**Closely adnate, not separable 111-120 



(Including as 117-120 the P. cinerea group with opaque zone 

 next to substratum and the largest cystidia on this zone.) 



1. Peniophora gigantea (Fr.) Massee, Linn. Soc. Bot. Jour. 25: 

 142. Je. 1889; Karsten, Finska Vet.-Soc. Bidrag Natur och 

 Folk 48: 422. 1889; Bresadola, I. R. Accad. Agiati Atti III. 

 3: 113. 1897; Bourdot & Galzin, Soc. Myc. Fr. Bui. 28: 401. 

 1913; Rea, Brit. Basid. 693. 1922. 



Thelephora gigantea Fries, Obs. Myc. 1 : 152. 1815; Syst. Myc. 

 1: 448. 1821. — Corticium giganteum Fries, Epicr. 559. 1838; 

 Hym. Eur. 648. 1874; Peck, N. Y. State Mus. Rept. 28: 52. 

 1876; Sacc. Syll. Fung. 6: 610. 1888. 



