98 



THE SIMPLE HOLOCARPIC BIFLAGELLATE PHYCOMYCETES 



Rhabditis monohystera with this parasite were un- 

 successful, and his results suggest that P. subuli- 

 formis may have a limited host range. 



It seems doubtful that Dangeard's species is dif- 

 ferent from Maupas' fungus, as Maire has sug- 

 gested. The predominantly unicellular thalli which 

 he describes and figures relate perhaps to segments 

 of a longer thallus which have separated. 



MITOCHYTRIDIUM 



Dangeard, 1911. Bull. Soc. Mycol. France 27: 

 202. 



This genus was created for a single intramatrical 

 species, M. ramosum, which parasitizes desmids of 

 the genus Docidium. Dangeard regarded this spe- 

 cies as intermediate between the Chytridiaceae and 

 Ancylistaceae, but Butler ('28) was of the opinion 

 that it should be included in the Cladochytriaceae, 

 close to Catenaria. Couch's ('35) discovery of this 

 species in North Carolina and his confirmation of 

 the presence of rhizoids and posteriorly uniflagel- 

 late zoospores justifies Butler's view, in the author's 

 opinion. 



RHIZOMYXA 



Borzi, 188-t. Rhizomyxa, nuovo ficomicete, Mes- 

 sina. 



This genus has been fully discussed by the pres- 

 ent author in his book on the Plasmodiophorales, 

 } 942. and need not be treated further at this point. 

 See discussion under Myzocytium also. 



bibliography: lagenidiaceae 



Atkinson, G. F. 1909. Ann. Mycol. 7: 441. 

 Barrett, J. T. 1935. Phytopath. 25: 898. 

 Berdan, H. B. 1938. Mycologia 30: 396. 

 Bessey, E. A. 1937. Textbook of mycology. Phila. 

 Butler, E. J. 1907. Dent. Agric. India I, no. 5: 1. 



. 1928. Ann. Bot. 42: 813. 



Carter, H. J. 1856. Ann. Mag. Nat. Hist. 2nd ser. 17: 101. 

 Cejp, K. 1932. Rozpravy Ces. Akad. 42 cis. 3. 1933, Ibid. 



43, cis. 9. 1935, Ibid. 45. 

 Chaudhuri, H. 1931. Arch. Protistk. 75: 472. 

 Cocconi, G. 1894. Mem. R. Acad. Sci. Inst. Bologna 4: 361. 

 Coker, W. H., and V. D. Matthews. 1937. North Amer. 



Flora 2, pt. 1: 17. 

 Constantineanu, J. C. 1901. Rev. Gen. Bot. 13: 369. 

 Cook, W. R. I. 1928. New Phytol. 27: 243. 1933. Glamoran 



County Hist. Xat. 1: 213'. 

 Cornu, M.1869. Bull. Soc. Bot. France 16: 222. 1870, Ibid. 



17: 297. 



. 1872. Ann. Sci. Nat. 5th Ser. 15: 21. 



. 1877. Bull. Soc. Bot. France 24: 266. 



Couch, J. N. 1935. Jour. Elisha Mitch. Sci. Soc. 51 : 293. 



. 1941. Amer. Jour. Bot. 28: 704. 



Dangeard, P. A. 1906. Le Bot. 9: 157, 207. 



De Bary, A. 1884. Vergleichende Morphologie der Pilze. 



Deckenbach, C. 1903. Flora 92: 278. 



Domjan, A. 1935. Folia Cryptog. 2: 31. 



Fitzpatrick, H. M. 1930. Pbycomycetes. New York. 



Fritsch, F. E. 1903. Ann. Bot. 17: 649. 



Gaumann, E. A. 1925. Vergleichende Morphologie der 



Pilze. Ziirich. 

 and Dodge. 1928. Comparative morphology of 



fungi. New York. 

 Graff, P. W. 1928. Mycologia 20: 158. 

 Gwynne-Vaughan, H. C. I., and B. Barnes. 1926. The 



structure and development of fungi. Cambridge. 2nd 



ed. 1937. 

 Karling, J. S. 1939. Amer. Jour. Bot. 26: 518. 



. 1941. Mycologia 33: 356. 



. 1942. The Plasmodiophorales. New York. 



Lind, J. 1913. Danish fungi as represented in the her- 

 barium of E. Rostrup. Copenhagen. 

 Lohwag, H. 1926. Arch. Protistk. 55: 1. 



Lotsy, J. P. 1907. Vortr. Bot. Stammengeschichte. Jena. 

 Maire, R. 1915. Bull. Soc. Hist. Nat. Afrique Nord 7: 50. 

 Martin, G. W. 1927. Mycologia 19: 188. 

 Matthews, V. D. 1935. Jour. Elisha Mitch. Sci. Soc. 51: 



306. 

 Maupas, E. 1915. Bull. Soc. Hist. Nat. Afrique Nord 7: 34. 

 Maurizio, A. 1895. Jahrb. Nat. Gesell. Graubundens 38: 9. 

 Minden, M. 1911. Krypt'fl. Mark Brandenburg 5:423. 

 Mundkur. B. B. 1938. Fungi of India. Suppl. I. 

 Petersen, H. E. 1910. Mycologia 8: 494. 

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Tabakregie 5:1. 

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 Saceardo, P. A. 1888. Sylloge Fungorum 7: 277. Ibid. 8: 



850. 1891, Ibid 9: 348. 1912, Ibid. 21: 857. 

 Scherffel, A. 1902. Nov. Kozl. I. 1902: 107-111. 



. 1926. Arch. Protistk. 54: 211, 245, 246. 



Schroeter, J. 1886. Cohn's Krypt'fl. Schlesiens 3:225. 



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Schultz-Danzig, p. 1923. Schr. Siissw. -und Meereskunde 

 11: 173. 



PLATE 25 



Protascus subuliformU 



(Figs. 4, 5, 9, 10, 12-14 after Dangeard, '06; figs. 1-3, 7, 

 8, 11, 15-20 after Maupas, '15.) 



Figs. 1-4. Spores with refractive adhesive (?) content. 



Fig. 5. Early infection stage; content of uninucleate 

 spore passing into host. 



Fig. 6. Later stage; parasite lying in host as an oval 

 globule. 



Fig. 7. Heavily infected nematode with numerous at- 

 tached spore cases and several thalli within. 



Fig. 8. Nematode with three elongate thalli. 



Figs. 9, 10. Uni- and tetranucleate thalli. 



Fig. 11. Elongate, curved, segmented, vacuolate thallus. 



Fig. 12. Separation of multinucleate thallus segments 

 and their transformation into sporangia. 



Fig. 13. Mitosis in a sporangium. 



Fig. 14. Nematode with numerous sporangia, two of 

 which are about to expel the spores. 



Fig. 15. Expelled comma-like spores. 



Fig. 16. Early stages in fusion of thallus segments con- 

 nected by fusion canals. 



Figs. 17-19. Zygospores. 



Fig. 20. Nematode with numerous empty sporangia and 

 zygospores. 



