FAMILY ARCHANGIACEAE 



1019 



assurgens Jahn. (Jahn, Beitrage zur 

 botanischen Protistologie. I. Die Poly- 

 angiden, Geb. Borntraeger, Leipzig, 

 5, 1924, 69; Archanghwi assurgeiis 

 Krzemieniewski, Acta Soc. Bot . Poloniae, 

 1927, 95.) 



Etymology : Latin assurgens, rising up. 



Size and color of the fruiting body as in 

 the species, likewise the inner structure, 

 size and arrangement of the rods. How- 

 ever, the tubules which together consti- 

 tute the fruiting bodies are more or less 

 free at their ends and stand up from the 

 substrate. Their diameter is somewhat 

 less (about 45 microns), 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 inter- 

 mediate strains makes a separation 

 difficult. 



Source and habitat : According to 

 Jahn, Archangium priniigenium is not 

 particularly common. It is usually 

 found on rabbit dung, sometimes on roe 

 dung. The variety assurgens is rela- 

 tively rare (found three times on rabbit 

 dung) Kofler (1930) on rabbit dung, 

 Vienna. Very rare in Polish soils ac- 

 cording to Krzemieniewski (1927). 



Illustrations: Quehl, Cent. f. Bakt., 

 II Abt., 16, 1906, 16, PI. 1, Fig. 5; Jahn, 

 Kryptogamenflora d. ]Mark Brandenburg, 

 V, Pilze I, Lief. 2, 1911, 201, PI. 1, Fig. 5; 

 Jahn (1924, loc. cit.) PL 1, Fig. 4, also 

 Fig. G, page 37; Krzemieniewski (1926, 

 loc. cit.) PL II, Fig. 23; (1927, loc. cit.) 

 PL IV, Fig. 3. var. assurgens, PL IV, 

 Fig. 1 and 2. 



3. Archangium flavum (Kofier) Jahn. 

 {Polijangium flavum Kofler, Sitzber. d. 

 Kais. Akad. Wiss. Wien. Math. -Nat. 

 Klasse, 122 Abt., 1913,864; Jahn, Beitrage 

 zur botanischen Protistologie. I. Die 

 Polyangiden, Geb. Borntraeger, Leipzig, 

 1924,71.) 



Etymology : Latin flavus, golden or 

 reddish-yellow. 



Swarm stage (pseudo Plasmodium ) : Not 

 described. 



Fruiting bodies : About 0.5 mm in 

 diameter, yellow, spherical or oval, 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 

 microns. 



Source and habitat : Kofier (1924) on 

 hare dung found in Danube meadows. 

 Reported as frequent in Polish soils by 

 Krzemieniewski (1926, 1927). 



Illustrations : Krzemieniewski, Acta 

 Soc. Bot. Poloniae, 4, 1926, PL II, Fig. 

 24. (1927), PL IV, Fig. 4, 5 and 6. 



4. Archangium serpens (Thaxter) 

 Jahn. (Chondromyces serpens Thaxter, 

 Bot. Gaz., 17, 1892, 403; Jahn, Beitrage 

 zur botanischen Protistologie. I. Die 

 Polyangiden, Geb. Borntraeger, Leipzig, 

 1924, 72.) 



Etymology: Latin serpens, creeping. 



Swarm stage (pseudo Plasmodium) : 

 Rods cylindrical, 0.6 by 5 to 7 microns. 

 Cultures on agar develop convoluted 

 form. 



Fruiting body : About 1 mm in di- 

 ameter, recumbent, consisting of numer- 

 ous loosely intertwined cysts, confluent 

 in an anastomosing coil, flesh-colored, 

 when dry dark red, 50 microns in di- 

 ameter, bent, occasionally somewhat 

 broadened or constricted, branched. 



Source and habitat : Thaxter, Bot. Gaz., 

 17, 1892, 389. On decaying lichens. 

 Cambridge, Mass. 



Illustrations: Thaxter {loc. cit.), PL 

 24, Fig. 24. 



5. Archangium thaxteri Jahn. (Bei- 

 trage zur botanischen Protistologie. I. 



