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(Ki\tzmg). Filaments moni- 

 liform ; ordinary cells spherical ; vesicular 

 cells elliptic ; spermatic cells elliptic or cy- 

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

 \A. 9. fig. 2; Sphcerozyga Ralfsii, Thwaites, 

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

 Cylindrospermum Ralfsii, Kiitzing, Tahulce 

 FhycologiccB, 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. jD./Smz7Aa, 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.Thwaitesiiy^dXh. 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, I. c. pi. 9. fig. 5. Spharozyga 

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

 232. In freshwater or brackish pools. (D. 

 Thompsoni, Ralfs, see Coniophytum.) 



For further details, see Ralfs on Nostocha- 

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



DOODIA, R. Brown. — A genus of Asple- 

 niese (Polvpodseous Ferns). Exotic. 



DORY'PHORA, Kiitz.— A genus of Dia- 

 tomaceae. 



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. BoecJcii, S.{Coccon€ma 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.Alg. 

 p. 50; Smith, Brit. Diatom, i. p. *]'] . 



DOTHIDEA, Fries.— A genus of Spha3- 

 riacei ( Ascomycetous Fungi), mostly g; owing 

 upon leaves. Numerous species are de- 

 scribed as British by Mr. Berkeley, some of 

 wdiich are now placed under other genera by 

 Fries ; thus D. Geranii, Robertiani, Ranun- 

 culi, PotentillcB and AlchemillcB of the Brit. 

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

 of Stigmatea in the Summa Veg.; D. alnea 

 is removed to Discosia, and D.jyyi'enophora 

 and sphceroides are placed under Dothiora, 

 Fries, a stylosporous form. The whole of 

 these ])lants 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 Uhni, 

 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 wdth 

 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. vmder Coniomy- 



CETES. 



DOTHIORA, Fries. See Dothidea. 



DOXOCOCCUS, Ehr.— Agenus 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, Ehv. 



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 and f {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") — ai-e probably Algae, or 

 their spores. 



Bibl. Ehr. Infus. p. 28. 



DRAPARNALDIA, Bory.— A genus of 

 Chactophorace8c(Coufervoid Algae), especially 



