1905] CURRENT LITERATURE 313 
The latter part of the paper is occupied principally with questions brought out 
by recent discoveries and theories relating to the rusts. It is shown that the 
uredo stage is probably responsible for the wintering of many rust fungi whose 
distribution and annual recurrence is not easily explained by the regular alter- 
nation of teleuto- and aecidiospores. Specialized races, immunity, susceptibility, 
and related subjects are discussed. The mycoplasm theory of Eriksson is con- 
sidered to be without foundation and absolutely erroneous in the light of the 
speaker’s investigations. Students will find this a valuable paper for refer- 
ence, outlining briefly the main questions that have occupied the minds of 
investigators at different periods in the development of mycology, while the 
bibliography of 209 titles is a means of easy access to the literature of the subject. 
ERIksson *4 also read a brief paper on the vegetative life of the Uredineae. 
This paper is a review of his mycoplasm theory, mainly as set forth in his former 
papers.—H. HASSELBRING. 
CAMPBELLS discusses in detail and combats Bower’s theory that the spike 
of Ophioglossum is the equivalent of a single sporangium of Lycopodium and 
that all pteridophytes are reducible to a common strobiloid type. He repeats his 
belief, hitherto published, that the progenitor of the large-leaved ferns may Have 
Sprung from some bryophyte type, and that the Ophioglossaceae may have arisen 
directly from an Anthoceros-like prototype. He regards a species of Ophio- 
glossum from Sumatra described by Bower (Ann. Bot. 18:205. 1904) as nearly 
realizing the hypothetical form suggested by him as the fern ancestor. The 
close relationship of the Ophioglossaceae and the Marattiaceae is pressed upon 
the grounds of structural resemblances in both gametophyte and sporophyte, 
and the conclusion is drawn that there is “no valid reason for removing the 
Ophioglossaceae from their association with the ferns.” He also reviews the 
evidence offered by recent writers in regard to the likeness existing between the 
Marsiliaceae and the Schizaeaceae. He thinks there is a marked resemblance 
between the sporocarp of certain of the former group and the fertile leaf segment 
of Schizaea, both as regards structure and the origin of the sporangium. se 
features combined with “the remarkable correspondence in the structure of the 
Sporangia”’ he considers sufficient evidence to ally the Schizaeaceae and the Marsi- 
liaceae not remotely—FLORENCE Lyon. 
IN continvatIon of his experiments with the Erysiphaceae SaLmon?° has 
established that i injury to plants in various ways makes such plants susceptible 
to biologic forms of Erysiphe to which they are normally immune. The fungus 
I a ia 
os gt J., On the vegetative life of some Uredineae. Ann. of Botany 
Ig: 55-60. 
*5 CAMPBELL, D. H., The affinities of the Ophioglossaceae and Marsiliaceae. 
American Nati es 168-715 figs. 9. 1904. 
- S., Further cultural sa with “biologic forms” of the 
20 SALMON, 
Erysiphaceae. pe of pina 19:125-148. 1905 
