254 



Mycologia 



Gymnosporangium exterum Arthur & Kern sp. nov. 



0. Pycnia epiphyllous, rather few, very sparsely disposed in 

 definite groups 3-6 mm. across, prominent, subepidermal, in ver- 

 tical section flattened-globoid, 95-1 25/x in diameter by 65-90^ 

 high; ostiolar filaments 48-65^ long. 



1. Aecia hypophyllous, very sparsely disposed in large groups 

 4-10 mm. or more across, on larger discolored areas, 0.1-0.3 mm - 

 in diameter by 0.5-0.8 mm. high ; peridium soon becoming rather 

 finely lacerate almost to base, spreading but not revolute, cells 

 usually seen only in face view, 10-18 by 58-100/x, inner wall ru- 

 gose with rather narrow ridges running downward and outward, 

 side walls rugose, 3— 5/x thick ; aeciospores broadly ellipsoid or glo- 

 boid, 17-21 by 21-26/x; wall very pale cinnamon-brown, medium 

 thick, 2-2.5/*, very finely verrucose, pores evident, 8-10, scattered. 



On Porter anthus stipulatus (Muhl.) Britton (Gillenia stipulacea 

 Nutt., Spiraea stipulata Muhl.), Perryville, Mo., 1884, C. H. 

 Demetrio (Rab.-Wint., Fungi Eur. 3323) ; Mammoth Cave, Ky., 

 June, 1870, T. F. Allen. 



III. Telia caulicolous, from a permanent mycelium, appearing 

 on fusiform swellings 2-6 cm. long by 0.5-1.5 cm. or more in 

 diameter, causing a considerable roughening and exfoliation of 

 the bark, flattened, irregular and indefinite in outline, usually anas- 

 tomosing over practically the whole surface of the swelling, light 

 chocolate-brown becoming yellowish by germination ; teliospores 

 ellipsoid, 18-23 by 32-42^, rounded or sometimes narrowed above 

 and below; wall light cinnamon-brown, rather thin, i-i-5/x, usu- 

 ally slightly thicker at apex, pores 1 in each cell, apical; pedicel 

 cylindrical, uniform, slender, 3-4/x in diameter, very long. 



On Juniperus virginiana L., Mammoth Cave, Ky., April 10, 

 1908, /. C. Arthur & F. D. Kern (type). 



Summary 



The following is a complete list of the successful cultures made 

 during the year 1908. It is divided into two series : species that 

 have previously been grown in cultures and reported by the 

 writer or other investigators, and species whose culture is now 

 reported for the first time. 



A. Species Previously Reported 



1. Puccinia Kuhniae Schw. — Teliospores on Kuhnia Hitch- 

 cockii A. Nels., sown on K. eupatorioides L. 



2. Puccinia Peckii (DeT.) Kellerm. — Teliospores on Car ex 

 stipata Muhl., sown on Onagra biennis (L.) Scop. 



