THE CLASSIFICATION OF THE TILOPTERIDACEiE. 181 



Kjellm. were identical was that he found what he con- 

 sidered non-sexual sporangia developed in a manner homo- 

 logous with that of the oogonia.^ From what is now known it 

 is quite possible that these are actually immature oogonia. 

 The condition shown at Fig. 10 a ^ (I.e.) might be due to 

 the attack of a E-hizopodium, such a knee-like appearance 

 being often due to the parasite. It may, indeed, later on, be 

 recognised as such, although in the early stage of the attack 

 it is hardly distinguishable from a developing sporangium. 

 Whether or not this be the correct interpretation, sporangia 

 do occasionally occur in an intercalary position in H. glo- 

 bosa. It was partly on account of this occurrence of in- 

 tercalary sporangia in Haplospora that Beinke proposed to 

 unite Scapliospora speciosa and Haplospora globosa under 

 the genus Tilopteris^ calling the plant Tilopteris globosa. 

 In view of the instability which is rather characteristic of 

 marine algse, this variation is of doubtful systematic signi- 

 ficance. Classification should depend on normal structure, 

 although abnormalities may be useful in giving clues to 

 correct interpretation. 



Subsequently to the finding of the plant with all three 

 kinds of reproductive organs, a specimen of H. globosa was 

 secured bearing, besides the usual sporangia, a few un- 

 doubted oogonia, but no antheridia. 



The modified genus Haplospora may therefore be dia- 

 gnosed as follows : — 



Haplospora (Kjellm.) limit. 7nutat. Fronds filiform, mono- 

 siphonous above, more or less polysiphonous below, branches 

 issuing irregularly from all sides of the main stem. Chro- 

 ma tophores small, roundish, many in each cell. Grrowth, 

 trichothallic. Asexual reproduction by motionless tetra- 

 nucleate spores formed singly in terminal stalked, sessile, 

 1 Cf. I.e., Sejx Ahdr. p. 16, and Figs. 10 6 5 and c t?, PL II. 



