1918] 
ZELLER AND DODGE—RHIZOPOGON 29 
This species has had such a varied history that only a care- 
ful study of types can untangle the synonymy. The plate 
cited above and early descriptions seem to make it synony- 
mous with R. luteolus Fr. & Nordh. which it antedates by ten 
years. Writers from Tulasne to DeToni include it among 
the synonyms of that species. Hesse thinks it a separate 
Species. 
14. Rhizopogon albus Fries, Syst. Мус. 2: 293-294. 1823. 
As in the preceding, the synonymy here is very involved, 
and type material must be studied. The Friesian species is 
usually said to be an ascomycete, but as we have been unable 
to find it reduced to synonymy until all the other descriptions 
of Rhizopogon albus were published, this seems to prevent the 
use of R. albus to designate other species, and they have 
mostly been transferred or renamed. (See excluded species.) 
15. Rhizopogon dubius (Corda) DeToni іп басс. Syll. 
Fung. 7: 164. 1888. 
Splanchnomyces dubius Corda, Icones Fung. 6 : 38. 1854. 
Illustration: Corda, Icones Fung. 6: pl. 7. f. 70. 
This is for me a doubtful species; I have not seen it, and it could 
not be found among Corda’s specimens; Corda did not make a draw- 
ing of the whole fungus as he usually did, and his original drawing 
shows only what is reproduced here. Only the spore size is noted 
in Corda’s handwriting, 3.4-3.9 y 
I can only inform my readers that as may be seen from the draw- 
ing, the (smooth) peridium may be dirty purple red, the septa dirty 
уч, the hymenium bright yellow, the spores colorless... . . 
I suppose that Corda had only a eee of this fungus to work 
with. It probably grows in Bóhm 
The almost pure yellow of the AM and the narrow, labyrinthi- 
form cavities separate this species from the previous and the follow- 
ing ones. —Zobel. 
EXCLUDED SPECIES 
1. Rhizopogon albus Berkeley in Smith, Brit. Fl. 5?: 299. 
1836, is Hymenogaster Klotzschu Tulasne Fung. Hypog. 64— 
65. 1851. 
2. Rhizopogon albus Corda in Sturm, Deutschl. Fl. Abt. 
III. Heft 19-20 : 43-46. pl. 14. 1841, is Choeromyces meandri- 
formis Vittadini, Mon. Tub. 51. pl. 2. f. 1, pl. 4. f. 10. 1831. 
