162 Bulletin 313 



CoLEOSPORiUM soLiDAGiNis (Schw.) Thiim. (= Peridermium 

 acicolum Underw. & Earle). 



"O. Pycnia amphigenous, scattered, numerous, originating be- 

 tween mesophyl and cortical layer, noticeable, 0.3-0.5 mm. wide by 

 0.5-0.8 mm. long, dehiscent by a longitudinal slit, low-conoidal, 

 8-100 fji high. 



''I. Aecia from a limited mycelium, amphigenous, numerous 

 scattered on discolored spots occupying a part of a leaf, erumpent 

 from longitudinal slits, tongue-shaped, 0.5-1 mm. long, by 0.50.7 

 mm. high; peridium rupturing irregularly, moderately firm, white, 

 cells over-lapping, 35-45 fi long, not much narrower, walls trans- 

 versely striate, inner coarsely verrucose, thick, 5-6 fx, outer less 

 rough and somewhat thinner seciospores ellipsoid, 20-25 by 28-40 /x. ; 

 wall colorless, closely and coarsely verrucose with deciduous tuber- 

 cles which are directed away from a smooth spot extending up one 

 side, thick, 2-3 fi on the smooth spot, increasing to 5-6 fi on the op- 

 posite side, including the tubercles. 



"II. Uredinia hypophyllous, rarely also epiphyllous, irregularly 

 scattered, or at first somewhat gregarious and crowded, 0.3-0.5 mm. 

 across, soon naked, yellow or orange-yellow, ruptured epidermis in- 

 conspicuous; urediniospores ellipsoid or globoid, 17-22 by 20-30 ft; 

 wall rather thin, 1-2 fx, closely and strongly verrucose; contents or- 

 ange-yellow when fresh, fading to colorless." (On Pinus rigida.) 



"III. Telia hypophyllous, scattered irregularly or sometimes 

 crowded and confluent, slightly elevated, 0.3-0.5 mm., across, red- 

 dish-orange ; teliospores with wall swelling 30-40 /n thick above ; con- 

 tents orange-yellow fading to colorless, terete, 15-23. by 55-80 «, 

 roimded or obtuse at both ends ; basidiospores globoid or elliptical, 

 about 12 by 18 ^a, orange-yellow." (On Solidago sp.) North Ameri- 

 can Flora, v. 7, p. 90. 



925. Infected pine needles showing aecia. 926. Cross-section of pine needle 

 showing aecia, 2/3. 927. Peridial cells, 1/12. 928. Aeciospores, 1/12. 929. 

 . Uredospores from leaf of cultivated aster, 1/12. 



Cronartium comptoni^ Arthur (= Peridermium pyriforme 

 Peck.). 



"O. Pycnia unknown. 



"I. Aecia appearing on the branches or often on the trunks, with 

 no or only slight fusiform enlargements, scattered and usually dis- 

 tinct, oval or irregular in outline, sometimes elongate 1-3 by 1-6 mm. 

 or large by becoming confluent, peridium not much exserted above 



