FAMILY II. ARCHANGIACEAE 



865 



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 



