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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



3. Peridium tardily or not at all dehiscent at apex. 



6. Peridial cells verrucose with roundish or oval papillae. 



6. Peridial cells verrucose-rugose with irregular papillae. 



6. Peridial cells smooth. 

 Peridium more or less tubular, altered by becoming lacerate and spreading. 

 7. Peridial cells rugose. 

 7. Peridial cells verrucose. 



8. Aeciospore-wall pale yellow. 



corniculans. 



cupressi. 

 biseptatum. 



nidus-avis. 



clavipes. 



Aeciospore-wall cinnamon-brown. 



gracile or clavarii forme. 



davisii. 



clavipes. 

 clavarii forme, 

 fraternum. 



libocedri. 



clavipes. 



nidus-avis, 

 asiaticum. 



On Aronia 



1. Aecia roestelioid, peridium retaining tubular or cornute form. 

 1. Aecia roestelioid, peridium becoming lacerate and spreading. 

 2. Peridial cells rhomboidal (45-90 n). 



2. Peridial cells oblong (80-130 jx), slightly curved when wet. 

 2. Peridial cells linear (150-300 /a), curved or coiled when wet. 



On Chaenomeles 



1. Aecia aecidioid. 

 1. Aecia roestelioid. 



2. Aeciospore-wall pale yellow, 21-32 x 24-39 fi, 

 2. Aeciospore-wall cinnamon-brown, 18-26 x 21-30 jj.. 

 3. Peridial cells rugose, with long ridges. 

 3. Peridial cells verruculose, with long papillae. 



On Comptonia (See Myrica) 



On Cormus (See Sorbus or Malus) 



On Cotoneaster 



1. Aecia roestelioid, peridium retaining tubular form, peridial cells spinulose, aeciospores 



verrucose. nanwutianum. 

 1. Aecia roestelioid, peridium becoming lacerate or fimbriate. 



2. Peridial cells rugose, aeciospore-wall rugose. distortwn. 

 2. Peridial cells rugose, aeciospore-wall verrucose. 



3. Aeciospores 19-22 X 19-26 jx. confusum. 



3. Aeciospores 18-24 X 19-35 /x. fusisporum. 

 2. Peridial cells papillose. sikangense. 

 2. Peridial cells verrucose. 



3. Aeciospore-wall cinnamon-brown. 



3. Aeciospore-wall pale yellow. 



On Crataegus 



1. Aecia aecidioid. 



2. Aeciospore-wall uniformly thick. 



3. Aeciospores small (12-20 X 14-23 fi). 

 3. Aeciospores large (24-29 X 30-32 fi). 

 2. Aeciospore-wall thicker above (up to 9/x). 

 1. Aecia roestelioid. 



4. Peridium remaining more or less tubular, somewhat lacerate. 

 5. Peridial cells tuberculate. 

 5. Peridial cells strongly spinulose. 

 5. Peridial cells verrucose-rugose. 



5. Peridial cells rugose. 

 4. Peridium losing tubular form, deeply lacerate. 



6. Peridial cells sculptured. 

 7. Peridial cells verrucose. 



8. Aeciospore-wall pale yellow. 



8. Aeciospore-wall cinnamon-brown. clavariiforme 

 7. Peridial cells rugose. 



9. Inner and side walls moderately rugose, rather thick (3-6 fi). 

 9. Inner and side walls strongly rugose, thick (5-7 /i). 



clavariiforme. 

 clavipes. 



libocedri. 

 magnum, 

 patulum. 



Icernianum. 

 exiguum. 

 malyi. 

 globosum. 



clavipes. 

 or gracile. 



betheli. 

 confusum. 



