. A handbook of cryptogamic botany. Cryptogams. ZYGOMYCETES 345 this order the whole group may be looked upon as a lateral branch of the Mucorini or Ancylistes successively modified (degraded) by aquatic parasitism, with its extremity represented by the Synchytrieae, Woronina (Cornu), and Rozella (Cornu). De Bary also discusses {loc. dt.) the suggested relationship to such algae as Protococcacese, Cha- racium, Chlorochytrium, &c. Apart from the possession of chlorophyll, the conjugation of zoospores in these algae separates them from the Chytridiaceae, in which group such a process has not
. A handbook of cryptogamic botany. Cryptogams. ZYGOMYCETES 345 this order the whole group may be looked upon as a lateral branch of the Mucorini or Ancylistes successively modified (degraded) by aquatic parasitism, with its extremity represented by the Synchytrieae, Woronina (Cornu), and Rozella (Cornu). De Bary also discusses {loc. dt.) the suggested relationship to such algae as Protococcacese, Cha- racium, Chlorochytrium, &c. Apart from the possession of chlorophyll, the conjugation of zoospores in these algae separates them from the Chytridiaceae, in which group such a process has not (at least as yet) been discovered. Granting a relationship of the simpler Chytridiaceae with Protococcaceae, &c., these might be regarded as leading up to Rhizidieae, Ancylisteae, and Mucorini; unless one regards the Chytridiaceae as com- posed of two distinct sub-groups, Rhizidieae and CladochytrieEe, related to Mucorini and Ancylistes; and the Olpidiese and Synchytrieae to Protococcaceae, &c. Only further research may determine these ques- tions of affinity. Sub-order i: Rhizidie^.—The life-history of Polyphagus Euglenae. Fig. 297.—Polyphagus EuglentE Now. A, zoospore with drop of fatty matter and nucleus. .5, young plant attached to resting Euglena, e. C, zoosporange containing spores resting on empty pro- zoosporange, a. I), coniugation: a, the receptive individual; 6, the supplying individual ; ^. the swollen end of conjugation tube (rudiment of resting-spore); e, e, e, the Euglense. £, portion of Zl five and a half hours later: i, empty, s, mature; represent the same parts as in D. (,A x 550, B, D, £, X 350, C X about 400.) (After Nowakowski.) (Nowak.), described by Nowakowski, furnishes us with the most highly developed type of the whole group. The mycele consists of very slender branching rhizoids, tapering each to a very thin point, and attaching themselves to the Euglena-hosts. The original germinating zoospore. Please note that these images are extract
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