DACTYLIUM. 



[ 188 ] 



DAPHNIA. 



Fig. 158. 



Dactylum fumo- 

 sum. 



Magn. 200 diams. 



while one kind germinates, the other kind 

 produces minute stalked bodies, one from 

 each chamber of the septate spore, destitute 

 of germinative power (spermatial). 



BIBL. Berkeley in Hook. Brit. Fl. v. pt. 2. 

 p. 219; Greville, Sc. Crypt. Fl. pi. 159; 

 Tulasne, Ann. des Sc. not. 3 ser. xix. 211. 

 pi. 12 & 13. 



DACTYLIUM, Nees. A genus of Muce- 

 dines (Hyphomycetous Fungi), nearly allied 

 to Botrytis, consisting of 

 moulds growing over de- 

 caying plants. Fries refers 

 Corda's species of Dacty- 

 lium to Dendryphium. One 

 species ,Dacty Hum oogenum, 

 Montagne, is remarkable 

 for its place of occurrence : 

 it grows upon the surface of 

 the membrane within the 

 shell of the eggs of fowls 

 and other birds. It does 

 not appear to have been 

 observed in this country, 

 but several foreign writers 

 have investigated it; and 

 from the experiments made 

 by Spring and Wittich, it 

 appears that the spores pass 

 through orifices existing in the shell, and 

 germinate in the interior, often in the air- 

 chamber. A full account of this plant and 

 of the literature, is given by Ch. Robin. 

 British species : 



1. D. pyriferum, Fr. On mouldering 

 stems of herbaceous plants. 



2. D. macrosporum, Fr. On rotten wood, 

 leaves, and fungi. 



3. D. dendroides, Fr. On decaying aga- 

 rics, &c. Very common. Grev. Sc. Crypt. 

 Fl. pi. 126. fig. 1. 



4. D. obovatum, Berk. On willow twigs, 

 in damp. Ann. Nat. Hist. vi. pi. 14. fig. 26*. 



5. D. sphcerocephalum, Berk. On dead 

 ivy-twigs, I. c. fig. 27. 



6. D. tenellum, Fr. On moss. 



BIBL. Berk, in Hook. Brit. Fl. v. pt. 2. 

 p. 345 ; Ann. Nat. Hist, ut supr. ; Berk. & 

 Broome, Ann. Nat. Hist. 2 ser. vii. p. 102; 

 Ch. Robin, Vegctaux Parasites, 2nd ed. 543. 

 pi. 2. figs. 5 & 6; Fries, Syst. Myc. iii. p.414; 

 Summa Veget. 491. 



DACTYLOCOCCUS, Nag. See PAL- 



MELLACE.E. 



DALTONIA, Hook, and Tayl. A genus 

 of Pleurocarpous Mosses, the species given 

 being restored here on account of the struc- 

 ture of the leaf, while D. heteromalla of 



Hooker goes to Hypnum on the same 

 ground. 



Daltonia splanchnoides, Hook, and T.= 

 Hookeria splanchnoides, Hook. 



DAM^EUS, Koch. See BELBA. 



DAN^A, Smith. A genus of Marattia- 



Fig. 159. 



Dansea. 



Part of a pinnule with sori. 

 Magnified 5 diameters. 



ceous Ferns, whence the family are some- 

 times called also Danasaceas. Exotic. 



DAPHNE, L. See THYMELEACE.E. 



DAPHNELLA, Baird. A genus of En- 

 tomostraca, of the order Cladocera, and fa- 

 mily Daphniadse. 



Char. Inferior antennae very large, each 

 branch consisting of two joints only. 



In Dr. Baird' s figures there are indications 

 of a third joint in the anterior branch of the 

 inferior antennas ; hence the single species, 

 D. Winyii (PI. 15. fig. 27), is only a Daphnia 

 or Sida. Aquatic. 



BIBL. Baird, Brit. Entomostraca, p. 109. 



DAPHNIA, Mull. A genus of Entomo- 

 straca, of the order Cladocera, and family 

 Daphniadse. 



Char. Head produced into a more or less 

 prominent beak ; superior antennas situated 

 beneath the beak, either one-jointed or con- 

 sisting of a minute tubercle with a tuft of 

 short filaments ; inferior antennas large and 

 powerful, two-branched, one branch three- 

 jointed, the other four-jointed ; five pairs of 

 feet. 



Valves of the carapace reticulated, mostly 

 four, terminated below by a longer or shorter 

 serrated spine. Anterior branch of inferior 

 antennas (PI. 15. fig. 28 b] four-jointed, first 

 joint very short ; from the end of the third 

 a long filament arises, and the fourth joint 

 is terminated by three others; posterior 

 branch three-jointed, the first and second 

 joints sending off a long filament, the third 

 terminated by three of them ; the filaments 

 are jointed near the middle, and usually 

 feathery. Eye spherical, with about twenty 



