“The occurrence of the identical species of fungus on two closely related plants, which respectively grow in the Caucasus and in North America and are missing in intermediate countries, deserves our deepest interest.... These plants are relics of the Tertiary period, during which North America and Europe still [pg 478] formed a continuous floral area. While the plants, on which the fungus grew, differentiated into two closely related species, in two at present widely separated but formerly connected radii of distribution, the parasitical Exobasidium remained outwardly unaltered. This is exactly like the case of another fungus, Uromyces glycyrrhizæ, which I have described and explained in the ‘Berichten der Deutschen Botanischen Gesellschaft’ (Bd. VII, 1890, S. 377-384). Exobasidium disc. is also a parasitical fungus which has been growing on the parent form of Rhododendron viscosum and Rhododendron flavum ever since that period when North America and Europe were continuous and possessed the same flora.”
I am also indebted to Professor Magnus and to Dr. Levier for the following names of closely allied species of plants which are found in America and Asia only, it being particularly noticeable that it is in Asia Minor and the Caucasus mountains that the relatives of the American species are most frequently met with.
Platanus occidentalis: North America.
Platanus orientalis: Asia Minor.
Liquidambar styraciflua: North America.
Liquidambar styraciflua: Asia.
Rhododendron viscosum: North America.
Rhododendron flavum: Caucasus Mts.
Rhododendron maximum: North America.
Rhododendron ponticum: Causasus Mts.
Professor Magnus has, moreover, recently pointed out that the fungus Uropyxis, which is a widespread American species and grows in Mexico, has a representative in Manchuria. In his monograph on Uropyxis, Professor Magnus enumerates further species of fungi which occur in America and Asia only and are missing in other portions of the world (P. Magnus, Berichten der Deutschen Botanischen Gesellschaft, Jahrgang 1899. Band xvii, Heft 3).
Referring the reader to Professor Edward S. Morse's trite article, Was Middle America peopled from Asia? (Appleton's Popular Science Monthly, November, 1898), I cite, from this, the following authoritative statements: “From the naturalist's standpoint the avenues have been quite as open for the circumpolar distribution of man as they have been for the circumpolar distribution of other animals and plants, down to the minutest land snail and low fungus. The ethnic resemblances supposed to exist between the peoples of [pg 479] the two sides of the Pacific may be the result of an ancient distribution around the northern regions of the globe.”
The very remarkable survival of certain plants and fungi, dating from the Tertiary period, in two such widely sundered countries as Asia Minor and North America, certainly finds a curious and striking parallel in the analogy of the cosmical ideas and social organization of Babylonia and Assyria with those of Mexico.
What is more: A cosmical scheme, attributable to a prolonged observation of natural celestial phenomena, such as could best have been carried on in circumpolar regions, has been shown to be as widespread as the Scandinavian flora which “is present in every latitude and is the only one that is so.”
Many of my readers will doubtless be inclined to explain the identity of cosmical and religious conceptions, social organization, and architectural plans shown to have existed in the past between the inhabitants of both hemispheres, as the result of independent evolution, dating from the period when primitive man, emerging from savagery, was driven southward from circumpolar regions, carrying with him a set of indelible impressions which, under the influence of constant pole-star worship, sooner or later developed and brought forth identical or analogous results.
Those who hold this view may perhaps go so far as to consider the possibility that, before drifting asunder, the human race had already discovered, for instance, the art of fire-making and of working in stone, had adopted the sign of the cross as a year-register, and evolved an archaic form of social organization. To many this view may furnish a satisfactory explanation of the universal spread of identical ideas and the differentiation of their subsequently independent evolution.
On the other hand, another class of readers may prefer to think that, while both hemispheres may have originally been populated by branches of the same race, at an extremely low stage of intellectual development, civilization and a plan of social organization may have developed and been formulated sooner in one locality than in another, owing to more favorable conditions and thence have been spread to both continents by a race, more intelligent and enterprising than others, who became the intermediaries of ancient civilization.