(453) 



For the telia: Chamaecyparis thyoides (L.) B.S.P. {Chamaecy- 

 paris sphaeroidea Spach, Cupressus thyoides L.). 



Type locality: Bethlehem, Pennsylvania, on Aronia Botry- 

 apium [ — Amelanchier canadensis}. 



Distribution: Along the Atlantic coast from Massachsetts 

 to New Jersey and Pennsylvania and in southern Alabama. 



Illustrations: Hedwigia 34: 3, /. 10; Farlow, Anniv. Mem. 

 Boston. Soc. Nat. Hist. pi. 2, f. 18-21; Bot Gaz. 49: pi. 22, f. 12. 



Exsiccati: Seym. & Earle, Econ. Fungi 243, 245; Rab.- 

 Wint. Fungi. Eur. 2Q22; Ellis & Ev. Fungi Columb. 1075; Ellis, 

 N. Am. Fungi 272; 1087; Thiim. Myc. Univ. 431; Roum. Fungi 

 Sel. 4534. 



20. Gymnosporangium Nidus-avis Thaxt. Bull. Conn. Exper. 



Sta. 107: 3. 1891 

 Roestelia Nidus-avis Thaxt. Bull. Conn. Exper. Sta. 107: 5. 1891. 

 Puccinia Nidus-avis Kuntze, Rev. Gen. PI. 3: 507. 1898. 

 Tremella Nidus-avis Arth. Proc. Ind. Acad. Sci. 1900: 136. 1901. 

 Aecidium Nidus-avis Farlow, Bibl. Index 1: 68. 1905. 



Aecia amphigenous, especially fruiticolous, cylindric, 2-4 

 mm. high by 0.4-6.7 mm. in diameter; peridium soon becoming 

 irregularly lacerate usually to base, slightly spread- 

 ing; peridial cells seen in both face and side views, Ian- s^ft 

 ceolate in face view, 15-23 XSS-88/i, linear in side view, ($0$ 

 14-18 /i thick, outer wall 1-1.5/* thick, smooth, inner pfegi 



row ridges, with shorter often roundish papillae in- JfeffKJ 



terspersed; aeciospores globoid or broadly ellipsoid, to£>g3. 



18-23X23-28/1, wall cinnamon-brown, rather thick, SriS! 



2.5-4/1, very finely verrucose, appearing almost smooth fc§|| 



Telia caulicolous, often dwarfing the young shoots p IG . jg. 

 and causing bird's nest distortions or witches' brooms, q_ Nidus- 

 usually causing a reversion of the leaves to the juvenile av \ s _ 

 form, sometimes appearing on isolated areas on the 

 larger branches and producing gradual enlargements, solitary or 

 rarely confluent, of variable size and shape, roundish to oval on 

 the young shoots, 1-2 mm. across, oval to narrowly elliptic 

 on the woody branches, 1.5-3 mm - wide by 2-7 mm. long, pul- 

 vinate when young becoming hemispheric, dark reddish-brown; 

 teliospores 2-celled, ellipsoid, 16-23X39-55/1, wall pale cinnamon- 

 brown, rather thin, 1-1.5/1, very slightly thicker at apex; pores 

 one in a cell, apical. 



