Al I.OMYCES l8l 



uork. ThaxtiT finds B. Prhtgsheimii hotli at Caml)ri(lgc, Mass., and at 

 Kittery Point, Mc. He also describes a new species, B. ramosa from 

 Kittery Point. The four described species* we list below, with references 

 to authors and important figures, omitting full descriptions, which may 

 he easily found under the references: 



BUistocladia Pringshcimii Reinsch '78, p. 291, pi. 16, figs. l-l,V Sec also Thaxtcr '96, p. 

 51, pi. y,, figs. I-I.^; and Petersen '10, p. 532, fig. 10. Sporangia much elongated, rest- 

 ing bodies with thick and pitted wall, not slipping from a sheath at maturity; sterile, 

 slender filaments often present among the reproducti\e bodies. 

 Blastodadia ramo.ui Thaxter '96, p. 50, pi. 3, figs. 14-16. Sporangia shorter; resting bodies 



with thin and scarcely pitted wall; sterile filaments absent. 

 Blastodadia roslrala Minden '12, p. 604. Much like B. Pringsheimii, but resting bodies 



slipping from sheath at maturity. 

 Blastodadia prolifera Minden '12, p. 604. Much like B. ramosa, but sporangia proliferat- 

 ing internally, as in Saprolcgiiia: the only species with this habit. Resting bodies 

 slipping from a sheath at maturity. 



ALLOMYCES Butler, 191 1, p. 1023.! 



Plant small, slender, the short or long stalk not conspicuously dif- 

 ferentiated; branches usually dichotomous, often verticellate in groups 

 of 3-5. separated from the nodes by distinct and complete septa, not 

 constricted at intervals; in vigorous cultures repeating the branching 

 in the same way to form a complex plant. Sporangia oval, terminal, 

 sympodially arranged, not rarely in chains of several, often clustered 

 by the shortening of the branches, which continue the stem by one or 

 more lateral buds beneath. Spores biciliate at times, but the two cilia 

 so closely approximated or fused as usually to appear as one. Resting 

 bodies borne in the same way as the sporangia and of the same size and 

 shape, at maturity enclosed in a thin, hyaline sheath out of which they 

 finally fall through an apical slit; the wall brown and conspicuously 

 pitted as in Blastodadia: the whole representing a thin-walled oogonium 

 completely filled with a thick-walled parthenogenetic egg, or a resting 

 sporangium as thought by Barrett ('12a, p. 365). 



A saprophytic aquatic of anomalous structure and differing from all 

 other Phycomycetes in the regular and normal septation of the plant body. 



* A fifth, B. strangidata Barrett, is treated here as a synonxm of Allomyces arbiis- 

 ctila, which see below. 



t The following treatment of the genus and species, as well as the plate, is taken with 

 slight modification from Coker and Grant in Journ. E. Mitchell Sci. Soc. 37: 180. 1922 

 (as Septodadia dichotomi). 



