158 



J. O. HAGSTROM, CRJTICAL RESE.ARCHES OM THE POTAMOGETONS. 



but the differences from P. Checsemanii cannot be explained from that fact, at least 

 not the short upper petioles, broader lamina, and the above described little cusp. Tlie 

 pisti] is also another and likeweise the stem-anatomy. I ref er to what is said under 



P. Cheesemanii and to the figures 75 and 91. 

 Although I have seen no ripe fruit and, besides, 

 but inconsiderable materials, I do not hesitate to 

 consider it as a distinct species which may ad interim 

 be united with the amplifolius-growp. 



Distribution. Neiv Zealand, Waihi stream, 

 Waikato, N. Isl., 84, Cheeseman (hb. Stockholm). 



P. Frycri Ar. Bennbtt. 



Two new Japanese Potamogetons, in The 

 Journ. of Bot., 1907, 234. — Fig. 76. 



The plant from Japan, Kiusiu, preserved in 

 hb. Stockholm, no doubt belongs to this species, 

 although the long spikes do not answer to the 

 description. The spikes are in flowering state 30— 

 40 mm, and deflorate 40—50 mm long. P. Frycri 

 is said to have the spikes merely 2 cm in length 

 and the peduncles thickened above, which is not 

 the caso with here accessible materials. A very 

 significant property of the Kiu-Siu plant is 

 I the long-petioled perianth-leaves. Limb broadly 

 sp rounded and shorter than the claw. rollen of 

 middle size and spheric. Styles elongated and in- 

 crassate upwards, with oval, rather small stigmas. 

 There would be no hesitation if the anatomic 

 diagram of the stcm wcre given in the description. 

 The plant here referred to has the following stem- 

 structure: The epidermis, which consists of large- 

 roomed cells, has a one- or two-cellcd strongt hcning 

 layer with bast-bundles scattercd at intervals. 

 These pseudo-hypodermal bast-bundles often show- 

 an inclination of moving a little inward to the 

 radial interlacunar walls. Interlacunarly there are 

 2 to '> circles of bast- and vascular bundles (sec the fig.). The endodermis consists 

 of 0-cells and the centra] cylinder has ten fiee vaseular bundles, six of wliieh are 

 lateral and 4 median, the arrangement consequently being prototypic as in P. 



Fig. 70. /'. Fryeri An. I3f.nm.tt. .1, The 



• leal ni the stem, } K, The Lowesl 



leal bal one, blade, J . C, Involucral Ic-if, liasc 



and top of Ihc bladi (blade ± 80 X ± 35 mm). 



/», Perianth Leal straightened, and magnified, with 



anthoi i, /.', Pistil, ", Bide-view. b, from the inside, 



tigmn from above, ',". /'. Pari of a ligiile in 



■ .-i .ii bi ' bowing a ridge and soroi 



bnndlee, j G, Pari "i n orosa-seotion <>f the 



i ",", /c, bnndle-trio, hp, strengthening layer 



with 8 b i bnndles, ep, epidermis ^'<-, cortioal 



bundles, ee, central cylind 



pulcht r. 



