ACINETINA. 



ACROSTICHE^E. 



emitting variable, very slowly contractile ex- 

 pansions, which are frequently dilated at the 

 ends, supported upon a simple pedicle, the 

 membranous envelope of which is more or 

 less prolonged over the body. 



The researches of MM. Pineau and Stein 

 tend to render the existence of the species of 

 Acineta doubtful, by showing that similar 

 organisms form intermediate stages of deve- 

 lopment of Vorticella, Vaginicola and Epi- 

 stylis. The organisms described by Mr. 

 Brightwell and Mr. Alder are probably re- 

 ferable to the same category. 



Compare also DENDROSOMA and ACTI- 

 NOPHRYS. 



BIBL. Pineau, Ann. d. Sc. nat. 3 ser. 

 Zool. iii. and ix.; Stein, Archiv f. Naturg. 

 1849; Alder, Ann. Nat. Hist.vii.', Brightwell, 

 Fauna In/us. Norfolk ; and Pritchard, Inf. 

 Anim.; Ehr. Infus.-, Duj. Infus. 



ACINETINA, Ehr. A family of Infuso- 

 ria, including the genera Acineta, Actino- 

 phrys, Trichodiscus, Podophrya, and Den- 

 drosoma of the same author. It corresponds 

 to the family Actinophryina, Duj., which see. 



ACMOSPORIUM, Corda. A genus of 

 Mucorini (Physomycetous Fungi). No Bri- 

 tish species yet recorded. 



ACOMIA, Duj. A genus of Infusoria, 

 of the family Enchelia. 



Char. Body oblong-ovate or irregular, co- 

 lourless or granular, turbid, composed of a 

 glutinous homogeneous substance containing 

 irregular granules, and ciliated only or prin- 

 cipally at one end. 7 species : 



1. A. cyclidium, marine, length 1-650. 



2. A. ovata, aquatic (fresh water), length 

 1-1250. 



3. A. vitrea (PI. 23. fig. 3), aquatic, 1-868. 



4. A. ovulum, aquatic, 1-300. 



5. A. vorticella, aquatic, 1-1000. 



6. A. costata, marine, 1-500 to 1-650. 



7. A. varians, aquatic, 1-450 to 1-1000. 

 ACREMONIUM, Link. A genus of Mu- 



cedines (Hyphomycetous Fungi), filamen- 

 tous Fungi. The plants consist of micro- 



Fig. 1. 



^ 



Acremonium fuscum (highly magnified). 



scopic septate filaments, bearing very slender 

 lateral branchlets, each terminating in a ve- 

 sicular spore. British species : 



1. A. verticillatum, Link, On dead wood, 

 trunks of trees. 



2. A. alternatum, Link. On decaying 

 leaves. 



3. A. fuscum, Schmidt (fig. 1). On dead 

 wood and sticks. 



BIBL. English Flora, v. pt. 2. p. 347; 

 Greville, Scott. Cryptogam. Flora, t. 124. 

 figs. 1 and 2. 



ACROCARPI. An artificial division of 

 Mosses (see MOSSES). 



ACROPERUS. A genus of Entomo- 

 straca, of the family Lynceidae (Baird). 



Char. Shell somewhat harp-shaped, the 

 anterior inferior margin projecting and ob- 

 tusely angular, inferior antennae long ; beak 

 blunt, very slightly curved downwards ; shell 

 striated with longitudinal ribs directed ob- 

 liquely downwards and forwards ; colourless. 

 2 species : 



1. A. harpee (PI. 14. fig. 1) ; each branch 

 of inferior antennae with 3 long setae from 

 the extremity of the last joint only. 



2. A. nanus (PI. 14. fig. 2), much smaller 

 than the last; anterior branch of inferior 

 antennae with 4 setae, 1 arising from the 

 second, and 3 from the end of the last joint. 



BIBL. Baird, Ann. Nat. Hist. xi. 91 ; and 

 Nat. Hist. Brit. Entomos. 129. 



This genus is scarcely distinct from Camp- 

 to cercus. 



ACROSPERMUM, Tode. A genus of 

 Sphaeronemei (Coniomycetous Fungi), con- 

 sisting of minute, somewhat cartilaginous, 

 epiphytic bodies, a few lines high, discharging 

 stick-shaped, simple, microscopic spores from 

 a terminal pore or ostiole. British species : 



1 . A. compressum, Tode. On dry stalks of 

 herbaceous plants. 



2. A.cornutum, Fries. On the gills of black- 

 ened Agarics (not uncommon). 



BIBL. English Flora, v. pt. 2. p. 221 ; 

 Grev. Sc. Crypt. Flora, t. 182. 



ACROSPORIUM, Nees. A generic 

 name, formerly applied to certain species of 

 Oidium (see OIDIUM). 



ACROSTICHE^. A sub-tribe of Poly- 

 podaeous Ferns, with naked sori, containing 

 the following genera : 



i. ACROSTICHUM. Sori seated on all the 

 veins, venules and parenchyma ; veins very 

 much branched, and anastomosing in more 

 or less regular meshes. 



ii. CAMPIUM. Sori on all the veins, ve- 

 nules and the parenchyma ; veins very much 



