fep?i 



duce witches' brooms it resembles G. juvenescens but differs from that 

 species in the smaller size and different origin of the sori and es- 

 pecially in the greater size of the teliospores. 



1 6. Gymnosporangium trachysorum Kern, Mycologia 2: 237. 



Aecia hypophyllous, gregarious, in irregular groups 2-5 mm. 

 across, on discolored slightly thickened spots, cylindric, 2-4 mm. 

 high, 0.2-0.3 mm - in diameter; peridium remaining horn-like, 

 finally rupturing by longitudinal slits along the sides; peridial 

 cells long and narrow in side view, 15-19X32-90^, lanceolate in 

 " w, 19-23 m broad, outer wall thin, 1.5-2/j, smooth or nearly 

 I side walls moderately thick, 3-6/i, closely subspinu- 

 lose with short spine-like papillae interspersed with 

 lower oval or ridge-like papillae; aeciospores globoid 

 or ellipsoid, 15-23 by 18-27^, wall chestnut-brown, 

 2.5-3^ thick, minutely verrucose. 



Telia caulicolous, appearing on abruptly fusiform 

 or somewhat gall-like enlargements 0.5-1.5 cm. in 

 diameter by 0.5-3 cm - l° n g> unevenly disposed, some- 

 times closely aggregated, often separated by the 

 scars of the sori of previous seasons, more or less 

 Fig. 15. G. wedge-shaped, often irregular and somewhat lacu- 

 rachysorum. nose, i. 5-2 mm. broad by 2-4 mm. long at base by 

 6-10 mm. high, surface rough with irregular warts 

 ind ridges, dark chestnut-brown; teliospores 2-celled, ellipsoid, 

 :8-2iX37-45ju> wall cinnamon-brown, rather thin, 1.5-2.5/1:; pores 

 t or 2 in each cell near the septum. 



For the aecia : Crataegus Marshallii Eggl. ( C. apiifolia Michx.), 



C. flavo-carius Ashe, C. Phaenopyrum (L. f.) Medic. (C. 



cordata Ait.). 



For the telia: Juniperus virginiana L. (Sabina virginiana 



Antoine). 



Type locality: Santee Canal, South Carolina, on Juniperus 



Distribution: From North Carolina southwest to Mississippi 



17. Gymnosporangium solenoides (Diet.) 

 Roestelia solitaria Miyabe, Bot. Mag. Tokyo 17 2 : 35, hyponym. 



1903. 

 Roestelia solenoides Diet. Bot. Jahrb. 32: 631. 1903. 



