Kern : Studies in the genus Gymnosporangium 503 



; 



Gymnosporangium floriforme Thaxter, sp. nov.* 



Pycnia epiphyllous, numerous, gregarious, on discolored spots, 

 punctiform, honey-yellow becoming blackish, subglobose, 150- 

 175 \i in diameter. 



Aecia hypophyllous, rather widely separated in oblong-annular 

 groups 2-6 mm. across, on discolored spots, at first cylindrical, 1- 

 1.5 mm. high, 0.2-0.5 mm. in diameter ; peridium soon becoming 

 finely fimbriate and strongly revolute ; peridial cells long and 

 narrow, 10-14 l l X 65-85 fi, becoming curved when wet ; aecio- 

 spores angular-ellipsoid, 1 8-23 }i x 23-29/;; wall chestnut-brown, 

 1.5-2.5/; thick, finely verrucose ; germ pores 6-8, scattered. 



On Crataegus spathulata Michx., Auburn, Lee County, Ala- 

 bama, October 21, 1 897, F. S. Earle & C. F. Baker; October, 1 897 

 F. S. Earle (in Sydow, Uredineen no. 11 94) ', October (year not 

 given) G. F. Atkinson ; Hot Springs, Arkansas, September 3, 1 897, 

 Win. Trelease. 



Telia scattered on globose or reniform galls, conical or cylin- 

 drical-acuminate, becoming 3-10 mm. long, 1-1.5 mm. wide, 

 chestnut-brown becoming yellowish and pulverulent by germina- 

 hon, surrounded by the ruptured epidermis ; teliospores 2-celled, 

 narrowly ellipsoid, 15-19/; by 39-50/;, rounded both at apex and 

 base, slightly or not constricted at the septum ; wall pale cinnamon- 

 brown, 1-1.5^ thick, smooth; pedicel hyaline, very long, 3-6 /; 

 >n diameter ; germ pores 2, near the septum. 



Aub 



( /«**> 



urn, Lee Co.. Alabama. March 



*Pycniis epiphyllis, numerosis, in greges dispositis, maculis decoloratis insidenti- 



us - punctiformibus, melleo-flavis, demum atrescentibus, subglobosis, 150-175 ^ diam. 



Aeciis hypophyllis, in greges oblongo-annulatos 2-6 mm. diam. laxe dispositis, 



"J acul 's decoloratis insidentibus, primo cylindraceis, 1-1.5 mm. altis, 0.2-0.5 mm. 



dlani -; peridio mox multifido-fimbriato, fimbriismultum revolutis ; cellulis peridii longis 



et *ngustis, 10-14 li X 65-85 ft, humidis flectentibus ; aeciosporis angulato-ellipsoideis, 



J^ 23 1* X 23-29 p • episporio castaneo-brunneo, 1.$-*$? crasso > subtiliter verrucu - 



; pons germinationis 6-8, sine ordine dispersis. 



' n foliis Crataegi spathnlatae in Alabama et Arkansas. 



Teliis in caespites globosos vel reniformes dispersis, conoideis vel cylindnco- 



CUm,n «is, demutn 3 -,o mm. longis, basi 1-1.5 mm. latis, castaneo-brunneis de.n au- 



ntla «s et pulverulentis, epidermide rupta cinctis ; teliosporis uniseptat.s, angusto- 



.'P^deis, ls . l9ft x 5 ice et basi ,-otundatis, medio non v. vix constrict.* ; 



str i0dilUte cinna ™meo-brunneo, I-I.31 crasso, levibus ; pedicellobyalino, long.s- 



mo ' 3-6/t diam.; poris germinationis binis juxta septum instructis. 



Cq In folii s ramulisque Sabinat virginianae ( Juniperi virginianae) Auburn, Lee 



■Alabama, Mar. it, 1897, F. S. Earle. 



