16 University of Calif ornia PuMications in Botany [Vol.6 



Janczewskia tasmanica Falk. 



Falkenberg, in Schmitz und Falkenberg. in Engler und Prantl, Die natiirl. 



Pfl.-fam.. 1 Th, abth. 2, p. 432, 1907 (nomen nudum) ; Fauna und Flora 



des Golfes von Neapel, 25 Monogr., pp. 2.57-259, pi. 24, figs. 18, 19, 1901 



(descr. and figures). 

 De Toni, Syll. Alg., vol. 4, sect. 3. p. 812, 1903. 

 Oltmanns, Morph. und Biol, der Algen, vol. 2, pp. 329, 330, figs. 583, 2. 



1905. 



Falkenberg in Schmitz iind Falkenberg, in Engler und Prantl. 

 Die 7iatilrl. Pfl.-fam.. (1 Th., abth. 2, p. 432, 1897). mentions a Janc- 

 zewsTiia which he names J. tasmanica as occurring in Tasmania, and 

 the inference is that it occurs on Lanrencia Forsteri. He also figures 

 this species (loc. cit., fig. 243 C) on the previous page. These refer- 

 ences, of course, constitute only a nomen nudum. Later Falkenberg 

 (1901. p. 257; pi. 24, figs. 18. 19) describes and figures Janczeivskia 

 tasmanica, thus placing it among the species to be considered as 

 established. Much, however, remains to be investigated before it can 

 be regarded as fully known. The writer, although he has not had 

 the opportunity of examining any specimens, has attempted below to 

 state what is known about this species and to compare it with the 

 species described above. 



Parasitic on Laiirencia Forsteri, Janczeivskia tasmanica forms its 

 more or less stellately branched tufts most commonly where a side 

 axis springs from the main axis. It does not cause any curvature or 

 bending of the host plant at the point of infection. 



The penetration into the host plant does not disturb even the 

 epidermal cells of the host, except that they are separated from one 

 another to allow the penetration of hyphae. or occasionally of more 

 complex filaments or strands of tissue which make their way between 

 the cells of the host plant to the very center. Only the tetrasporangial 

 plant is figured or described. From the figure, that seems to be a 

 plant of 3-4 mm. in greatest diameter. The tubercle or solid portion 

 is 0.5-1.0 mm. thick, flattened, and encircling the entire host plant at 

 the region of infection. From about one-third of the surface of the 

 tubercle arise slender simple, or occasionally branched, free branches. 

 1-2 mm. in length and not over 0.5 mm. in diameter. The tetraspo- 

 rangia are borne subepidermally on the upper portions of the free 

 branches. Falkenberg does not mention having examined either anthe- 

 ridial or cystocarpic plants, consequently extended comparison with 

 the species of Janczewskia described above is impossible. 



