gi12 BOTANICAL GAZETTE [APRIL 
swims about again until it finally escapes.” The reviewer did not state that the 
flagellum is retracted when the amoeboid movements take place and does not 
regard it as at all likely that such is the case. 
Griccs places the organism in the Olpideaceae, and states that it may be 
separated at once from all other genera of this family by its habitat. ‘‘All the 
other genera are parasites of aquatic plants or animals except Asterocystis, which 
of Olpidium. O. brassicae (Wor.5) Dang.,° a typical Olpidium, is pore 
in the stems of cabbage seedlings. O. simulans (DeBary and Wor.’) Dang.° 
(see also A. FISCHER?) is parasitic in young leaves of Taraxacum officinale and is 
associated with Synchytrium taraxaci. SCHROETER*® is inclined to believe this 
is a Pleolpidium, but it would still be a member of the Olpidiaceae. Olpidium 
trifolii (Pass.*t) SCHROETER"? on petioles and leaf blades of Trijolium repens is 
more doubtful; A. FiscHer*s thinks it is a Synchytrium. 
It is unfortunate that the author did not compare his organism with the genus 
Reesia Fisch*+ (pp. 8-17), since until we know more about the dehiscence of the 
zoosporangium and the form of the active zoospores, it would seem more reason- 
able to place it in this genus than to create a new one, largely hypothetical; for 
if the zoosporangia develop exit tubes and the zoospores are uniciliate, which is 
not unlikely, it would be a true Reesia.—Gro. F. ATKINSON. 
Morphology of the grass flower.—ScHUsTER®® has recently made extended 
investigations upon the structure and morphology of the flowers and spikelets 
of grasses. His results are based upon an examination of fresh and alcoholic 
4See Bot. GAZETTE 48: 321, 322, 324. 1909. 
5 Chytridium brassicae Woronin, M. (see pp. 556-5 $8. pl. 3I. bat Le - 
Plasmodiophora oo bis der Kohlpflanzen-Hernie. Jahrb. Bot. 
11:549-574. pls. 29-34. 
© DANGEARD, P., Ann. Sci. Nat. Bot. VII. 4:285, 327. 1886. 
7 Chytridium (Olpidium) simulans DeBary and Wor. (see p. 29. pl. 2+ figs. 1 1-10); 
ag zur rire der Chytridieen. Ber. Naturf. Ges. Freiburg 3:Heft 2 (14° 
of soarees pl. I. 1863. 
8 Rabenh., pe Fl. Pilze 4:29. 1892. 
9 ENGLER AND PRANTL, Pflanzenfam. 11:70. 18809. 
10 Synchytrium trifolii Pass. in Rab. Fung. Europ. 2419. 1877. 
*t CoHN’s Krypt. Fl. Schles. Pilze 1:181. 1889; and ENGLER und PRANTL, 
Pflanzenf. 11:68. 188 
12 Rabenh., Krypt. Fl. Pilze 4:51. 1892 
: 3 FiscH, Cart, Beitrag zur Kenntniss der Chytridiaceen. pp. 48. pl. I. 
gen. 1884. 
14 SCHUSTER, J., Ueber die Morphologie der Grasbliite. Flora 100: 213-266. 
pls. 2-5. figs. 35. gto. 
Erlan- 
