DOODIA. 



[ 215 ] 



DRAPARNALDIA. 



spermatic cells linear, catenate (Ralfs, Ann. 

 Nat. Hist. ser. 2. v. pi. 9. fig. 1). Form- 

 ing extensive strata, composed of thick gela- 

 tinous masses of a deep green colour, on 

 boggy pools ; filaments consisting of 100 to 

 200 cells. 



2. D. Ralfsii (Kutring). Filaments moni- 

 liform ; ordinary cells spherical ; vesicular 

 cells elliptic ; spermatic cells elliptic or cy- 

 lindrical, one or two in each series. Ralfs, I. c. 

 pi. 9. fig. 2; Sphcerozyga Ralfsii, Thwaites, 

 Harvey's 'Man. Brit. Alga, 2 ed. p. 233. 

 Cylindrospermum Ralfsii, Kiitzing, Tabula 

 Phycologicce, i. pi. 98. fig. 7- Forming 

 extensive strata of a velvety rich dark green 

 colour, sometimes verging towards aeruginous 

 green ; on rivulets and in bogs. 



3. D.Smithii, Thwaites. Filaments straight, 

 each included in a definite gelatinous sheath; 

 ordinary cells subspherical, compressed, about 

 as long as wide ; vesicular cells subspherical, 

 somewhat barrel-shaped, half as wide again 

 as the ordinary cells, puncta very distinct ; 

 spermatic cells cylindrical, very unequal in 

 length, and with the ends rounded and some- 

 what truncated. Ralfs, /. c. pi. 9. fig. 4. 

 Freshwater boggy pools. 



4. D. Thwaitesii,JMfs. Filaments straight, 

 or nearly so ; ordinary cells quadrate ; vesi- 

 cular cells oblong, subquadrate, puncta very 

 distinct ; spermatic cells numerous, cylindri- 

 cal, with truncated ends, very variable in 

 length. Ralfs, 1. c. pi. 9. fig. 5. Sphcerozyga 

 Thwaitesii, Harvey, Man. Br. Alga, 2 ed. 

 232. In freshwater or brackish pools. (D. 

 Thompsoni, Ralfs, see CONIOPHYTUM.) 



For further details, see Ralfs on Nostocha- 

 cea, Annals of Nat. History, ser. 2. v. 321. 



DOODIA, R. Brown. A genus of Asple- 

 nieae (Polypodaeous Ferns). Exotic. 



DORYPHORA, Kiitz. A genus of Dia- 

 tomaeeae. 



Char. Frustules single, stalked; valves 

 orbicular, lanceolate or broadly elliptical, 

 with a median longitudinal line, but no no- 

 dules. Marine. 



The valves are furnished with transverse 

 or slightly radiating lines, resolvable into 

 dots. 



D. amphiceros, K. (PI. 12. fig. 29 ; a, side 

 view of frustule ; b, front view ; c, prepared 

 valve). Valves orbicular, lanceolate, or 

 broadly elliptical, ends produced; length 

 1-500 to 1-800". 



D. Boeckii, S.(Cocconema B., K.). Valves 

 elongato-lanceolate, ends somewhat obtuse ; 

 length 1-144". (This species appears to 

 have a median and terminal nodules.) 



BIBL. Kiitzing, Bacill. p. 74 ; Sp. Ala. 

 p. 50 ; Smith, Brit. Diatom, i. p. 77- 



DOTIIIDEA, Fries. A. genus of Sphae- 

 riacei ( Ascomycetous Fungi), mostly gi owing 

 upon leaves. Numerous species are de- 

 scribed as British by Mr. Berkeley, some of 

 which are now placed under other genera by 

 Fries ; thus D. Geranii, Robertiani, Ranun- 

 culi, Potentillce and Alchemillce of the Brit. 

 Flora, and D. Chcetomium, Kze., are species 

 of STIGMATEA in the Summa Veg.\ D. alnea 

 is removed to DISCOSIA, and D.pyrenophora 

 and sphceroides are placed under DOTHIORA, 

 Fries, a stylosporous form. The whole of 

 these plants require further study, since it is 

 probable that they are really connected with 

 the Sphaeronemei or Melanconiei, for the ob- 

 servations of Mr. Berkeley go to show that 

 Asteroma Ulmi is a form of Dothidea Ulmi, 

 while Tulasne has found upon Dothidea Ri- 

 besii spores or spermatia like those of Xyla- 

 rice, others in excavated cavities having the 

 character of the spores of Septoria, while in 

 ordinary cases the surface is covered with 

 conceptacles filled with eight-spored asci. 

 See CONIOMYCETES. 



BIBL. Berk. Br. Fl. ii. pt. 2. p. 285; Ann. 

 Nat. Hist. vi. 364 ; Berk, and Br. Ann. Nat. 

 Hist. 2 ser. ix. 385 ; Fries, Summa Veget. 

 pp. 386. 418 & 421 ; Corda, Ic. Fung. iv. 

 p. 119. Also the Bibl. under CONIOMY- 

 CETES. 



DOTHIORA, Fries. See DOTHIDEA. 



DOXOCOCCUS, Ehr. A genus of Infu- 

 soria, of the family Monadina. 



Char. No tail ; no eye-spot ; motion nei- 

 ther that of simple progression nor rotation, 

 but an irregular kind of rolling-over. 



Organ of locomotion unknown, Ehr. 



D. ruber (PI. 23. fig. 47 a, after Ehr.). 

 Body globose, brick-red, more or less opake; 

 breadth 1-1728". Aquatic. 



This organism is almost beyond doubt the 

 same as that represented in PI. 23. fig. 24, 

 d &ndf(nobis),i. e. a form of Trachelomonas 

 volvocina (TRACHELOMONAS). This was 

 suspected by Ehrenberg. 



D. pulvisculus, E. (PI. 23. fig. 47 b) is 

 probably an early stage of the same. 



The other two species D. globulus (sub- 

 globose or ovate, hyaline ; marine ; breadth 

 1-864"), and D. incequalis (subglobose, un- 

 equal, hyaline, speckled with green; aquatic; 

 breadth 1-2400") are probably Algae, or 

 their spores. 



BIBL. Ehr. Infus. p. 28. 



DRAPARNALDIA, Bory. A genus of 

 Chaetophoraceae(Confervoid Algae), especially 



