Page:Bergey's manual of determinative bacteriology.djvu/887

 In transmitted light one sees that the fruiting body is made up of numerous intes- tine-like convolutions closelj' appressed, not, however, always definitely delimited. These tubes usually have a diameter of from 70 to 90 microns, often constricted and at- tenuated. No membrane is present. The rods in the fruiting bodies are about 4 mi- crons long and 0.8 micron wide. Upon pres- sure on the fruiting bodies, the rods remain together in small fragments of various sizes. Habitat: Found on rabbit dung, some- times on roe dung. According to Jahn {loc. cit.), not particularly common. Illustrations: Quehl (Cent. f. Bakt., II Abt., 16, 1906, 16, PI. 1, Fig. 5), Jahn (Kryp- togamenflora d. Mark Brandenburg, V, Pilze I, Lief. 2, 1911, 201, PI. 1, Fig. 5), Jahn (op. cit., 1924, PI. 1, Fig. 4, also Fig. G, page 37) and Krzemieniewski (Acta Soc. Bot. Poloniae, 4, 1926, PI. II, Fig. 23; also .see op. cit., 1927, PI. IV, Fig. 3, var. assurgens and PI. IV, Figs. 1-2). 2a. Archangium primigenium var. as- surgens Jahn, 1924. (Beitriige zur bot. Pro- tistologie. I, Die Polyangiden. Geb. Born- traeger, Leipzig, 1924, 69.) as.sur'gens. L. part. adj. assiirgens ris- ing up. Size and color of the fruiting body as in the species, likewise the inner structure, size and arrangement of the rods. However, the tubules which together constitute the fruiting bodies are more or less free at their ends and stand up from the substrate. Their diameter is somewhat less (about 45 mi- crons), they are often convoluted so that they many times appear to be constricted (like pearls). Pronounced races of the species and of the variety are so different in habits that they may be regarded as distinct species. Jahn believes the presence of intermediate strains makes a separation difficult. Habitat: Relatively rare, being found only three times on rabbit dung by Kofler (Sitzber. d. kais. Akad. wiss. Wien, math.- nat. Klasse, Abt. I, 122, 1913). Very rare in Polish soils according to Krzemieniewski (Acta Soc. Bot. Poloniae, 5, 1927, 95). 3. Archangium flavum (Kofler, 1913) Jahn, 1924. {Polyangium flavum Kofler, Sitzber. d. kais. Akad. w^iss. Wien, math.- nat. Klasse, Abt. I, 122, 1913, 864; Jahn, Beitrage zur bot. Protistologie. I, Die Poly- angiden. Geb. Borntraeger, Leipzig, 1924, 71.) fla'vum. L. adj. flavus yellow or golden. Swarm stage (pseudoplasmodium) : Not described. Fruiting bodies: About 0.5 mm in diame- ter, yellow, spherical or ellipsoidal, with humped or padded surface. The mass of cells quite homogeneous; upon pressure under cover glass, single sections tend to adhere. No membrane, though the rods are so tightly linked that when cautiously placed under a cover glass, the form of the fruiting body is retained. Rods 2 to 4 mi- crons. Source: Found by Kofler (1924) on hare dung found in Danube meadows. Habitat: Found on decaying organic mat- ter in soil and in the dung of various ani- mals. Reported as frequent in Polish soils by Krzemieniewski (1926, 1927). Illustrations: Krzemieniewski (Acta Soc. Bot. Poloniae, 4, 1926, PI. II, Fig. 24; also see ibid., 1927, PI. IV, Figs. 4, 5 and 6). 4. Archangium serpens (Thaxter, 1892) Jahn, 1924. {Chondroniyces serpens Thaxter, Bot. Gaz., 17, 1892, 403; Jahn, Beitrage zur bot. Protistologie. I, Die Polyangiden. Geb. Borntraeger, Leipzig, 1924, 72.) ser'pens. L. part. adj. serpens creeping. Swarm stage (pseudoplasmodium) : Rods cylindrical, 0.6 by 5 to 7 microns. Cultures on agar develop convoluted form. Fruiting body: About 1 mm in diameter, recumbent, consisting of numerous loosely intertwined cj^sts, confluent in an anasto- mosing coil, flesh-colored, when dry dark red, 50 microns in diameter, bent, occasion- ally somewhat broadened or constricted, branched. Source: Found on decaying lichens from Cambridge, Mass. Habitat: Decaying lichens. Illustrations: Thaxter {op. cit., PI. 24, Fig. 24). 5. Archangium thaxteri Jahn, 1924. (Beitrage zur bot. Protistologie. I, Die