Witson: North AMERICAN PERONOSPORALES 83 
13. ALBUGO PORTULACAE (DC.) Kuntze, Rev. Gen. 
Pl, 23 668) f80t 
Uredo Portulacae DC. Fl. France 5: 88. 1815. 
Cystopus Portulacae de Bary, Ann. Sci. Nat. 1V. 20: 131. 1863. 
Sori white or yellowish, on all, parts of the host except the 
roots, rounded or irregular in outline, up to 5 mm.; conidiophores 
clavate, about 9 x 25 yp, hyaline; conidia dissimilar, the terminal 
larger, cylindrical and papillate, the basal smaller, subglobular, 
about 12-15 x 15-22 yp, walls hyaline, contents light-yellow ; 
odspores borne in the stems and leaves, globular, dark-brown, 
about 70 4; epispore regularly reticulated, with short ridges or 
papillate tubercles in the areas. 
This species is restricted throughout its range to a single host, 
upon which it does not appear to be very common, although the 
distribution of both host and fungus is probably coextensive. It 
is easily distinguished from related species by the uniform thick- 
ness of the conidial membrane and by the tubercles in the areolae 
of the odspore. The morphology of this species has been studied 
by Stevens.* 
On PoRTULACACEAE: 
Portulaca oleracea \., Connecticut, Underwood ; Georgia, 
* Underwood ; Mlinois, Blount, Burrill, * Earle, Waite ; In- 
diana, Bolley, Olive, * Underwood ; lowa, * Arthur ; Mis- 
souri, Galloway ; New Jersey, Zils (N. Am. Fungi 1808), 
Halsted (Econ. Fungi 264a); New York, Underwood ; 
New Mexico, * Cockerell ; Ohio, Tyler (Ohio Fungi 83) ; 
Ontario, Dearness (Fungi Columb. 45, Econ. Fungi 2646) ; 
South Carolina, Ravenel (Fungi Am. 500) ; South Dakota, 
* Chaney, * Griffiths (W. Am. Fungi 37). 
Type Locaity : France, on Portulaca oleracea L. 
Disrripution: Vermont to South Dakota, New Mexico and 
Georgia. Also in South America, Europe, Asia and Africa. 
SPECIES EXCLUDENDAE 
While several names have been proposed under this genus 
which for one reason or another cannot be retained, it wm, £ hanalas 
scarcely necessary to mention any of these which have not gained 
admission to Saccardo’s Sylloge Fungorum. 
