EURYCERCUS. 



[ 249 ] 



EXPECTORATION. 



more investigation, which may readily be 

 made by a practised microscopist, since the 

 materials are everywhere at hand, on decay- 

 ing fruits, mildewed preserves, or plants 

 imperfectly dried for herbaria, &c. 



Eurotium Rosarum, Greville (Sc. Crypt. 

 Fl.)=Erysiphe pannosa. 



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

 p. 333; Greville, Scot. Crypt. Fl. pi. 164. 

 fig. 1 ; Sowerby (Farinaria), pi. 379. fig. 3 ; 

 De Bary, Eot. Zeit. xii. p. 425 (1854) ; Riess, 

 ibid. xi. p. 134, and Fresenius, p. 474 (1853). 



EURYCERCUS, Baird (Lynceus, in part, 

 Mull.). A genus of Entomostraca, of the 

 order Cladocera, and family Lynceidse. 



Char. Subquadrangular (in side view) ; 

 abdomen very broad, flattened, densely ser- 

 rated; beak blunt, slightly curved down- 

 wards. Aquatic. 



E. lamellatus (PI. 15. fig. 39). Shell olive, 

 ciliated on the anterior ventricose margin, 

 arched behind ; beak rather blunt and short; 

 superior antennae terminated in six short 

 spines, each with a fine seta or bristle ; an- 

 terior branch of inferior antennae with five 

 long filaments, one from the end of the first 

 and second joints, three from the third, as 

 also a small spine; posterior branch with 

 three long filaments at the end of the last 

 joint, the first and second each with a short 

 spine only. 



It generally lives at the bottom of the 

 vessel in which it is kept. 



BIBL. Baird, Brit. Entom. p. 123. 



EVADNE, Loven. A genus of Entomo- 

 straca, of the order Cladocera, and family 

 Polyphemidae. 



Char. Abdomen short, scarcely projecting 

 from the shell ; head not distinct from the 

 body; marine. 



E.Nordmanni (PL 14. fig. 30). Colourless, 

 excepting the eye. 



Forms part of the food of the herring. 



BIBL. Loven, Wiegmann's Archiv, 1838. 

 Bd. i. p. 143; M.-Edwards, Hist. Nat. d. 

 Crustac. iii. 390; Baird, Brit. Entom. p. 

 114. 



EVERNIA, Ach. (Physcia, Schserer). 

 A genus of Parmeliaceae (Gymnocarpous 

 Lichens), containing one species (E.prunas- 

 tri), common on trees, but not often found 

 in fruit. 



BIBL. Hooker, Brit. Flor. ii. pt. 2. p. 228; 

 Schserer, Enumeratio Crit. p. 11. 



EXCIPULA, Fr. A genus of Phragmo- 

 trichacei (Coniomycetous Fungi), forming 

 horny tubercles on dead stems and leaves, 

 finally opening by an entire orbicular aperture. 



The stylospores are elongated, lanceolate 

 or fusiform, and long hair-like processes are 

 sometimes mixed with the sporophores which 

 line the disk. Four British species are re- 

 corded : E. Rubi and E. striaosa of Fries, 

 and E. macrotricha and E. ch&tostroma of 

 Berk, and Br. Perhaps related to some 

 Ascomycetous form. (See CONIOMYCETES.) 



BIBL. Berk, in Hook. Br. Flor. ii. pt. 2. 

 p. 296 ; Berk, and Broome, Ann. Nat. Hist. 

 2 ser. v. 456. pi. 11. fig. 2. 



EXIDIA, Fr.A genus of Tremellini 

 (Hymenomycetous Fungi), forming gelati- 

 nous, flat, or sometimes undulated and ear- 

 like coloured expansions on the trunks and 

 branches of trees. Common in autumn and 

 winter. Tulasne has lately published some 

 interesting observations on the structure of 

 the hymenium which clothes the upper face. 

 This is composed of a densish layer of very 

 slender filaments, which bear at their free 



Fig. 211. 



Fig. 212. 



Exidia recisa. 



Fig. 211. Upper surface. Fig. 212. Lower surface. 

 Natural size. 



surface globular cells (basidia) divided verti- 

 cally into two or four chambers ; from each 

 of these arises a slender process (sterigma), 

 at the end of which is developed a stylospore. 

 In E.spiculosa, spermatia were also observed 

 in young specimens, at the ends of very 

 slender filaments passing through the muci- 

 laginous layer overlying the layer of basidia. 

 (See DACRYMYCES and other genera of 

 TREMELLINI.) 



BIBL. Berk, in Hook. Brit. FL ii. pt. 2. 

 p. 217; Tulasne, Ann. des Sc. nat. 3 ser. 

 xix. p. 202. pi. 11 &12. 



EXOCOCCUS, Nageli. Probably a Pro- 

 tococcus or Palmella. 



BIBL. Nageli, Neuer Algensyst. p. 169. 



EXOGEN. See DICOTYLEDON. 



EXOSMOSE. See ENDOSMOSE. 



EXPECTORATION. The various ob- 

 jects which may be found in the expectora- 

 tion are noticed under their respective heads, 

 or those of the tissues from which they are 

 derived ; a list only need be given here. 



Mucous corpuscles, i. e. young epithelial 



