ASTATHE. 



ASTEROPHORA. 



Two flagelliform filaments. 

 Both alike. 



Animals green, with a red eye- 

 spot ........................ Chlorogonium,'E, 



Colourless, no eye-spot ...... Zygoselmis, Duj. 



Several filaments ................ Polyselmis, Duj . 



BIBL. Ehrenberg, In/us.; Dujardin, In- 

 fus.; Morren, Sur la Rubefaction des Eaux, 

 Brax. 1841 ; Cohn, Protococcus pluvialis, 

 Nova Acta Ac. L. C. N. C. xxii. p. 397- 

 (Abstract in Ray Society's Volume of Bota- 

 nical, 8fc. Papers for 1853, p. 362 et seq.} 



ASTATHE. See PRIMORDIAL UTRICLE. 



ASTERODICTYON, Ehr. (Ber. d. Berl 

 Akad. 1845). See MONACLINUS. 



ASTERODISCUS, Ehr. A genus of ex- 

 isting radiate Polythalamia or Foraminifera. 



Char. Polysomatous ; animalcules acer- 

 vate, never articulate; gemmae protruding in 

 one plane, forming flat, discoidal polyparies, 

 with distinct oscula which are open after 

 death; marginal cells of the disk radiate, 

 unequal. 



A. Forskalii. Discoidal; disk thin, margin 

 dentato-lacerate, surface foveolate, apertures 

 small. Suez and St. Domingo. 



Mr. Johnson has given the same name to 

 a genus of Diatomacese, not differing, as far 

 as we can determine, from Asteromphalus, 

 Ehr. 



BIBL. Ehrenberg, Abh. der Berl. Akad. 

 1848, pp. 121, 130 ; A. S. Johnson, Silliman's 

 Journ. 1852, xiii. p. 33; Pritchard, Inf. Ani- 

 mal. p. 319. 



ASTEROLAMPRA, Ehr. A genus of 

 Diatomaceae. 



Char. Free; frustules single, equally 

 bivalve, circular; central portion imper- 

 fectly divided by thin septa, which do not 

 reach the margin, but alternate with rays 

 extending to the margin, unsupported by 

 septa ; fossil. Intermediate between Actino- 

 cyclus and Actinoptychus. 



A. Marylandica (PL 19. fig. 5) . Marginal 

 rays eight, septa eight ; interstices between 

 the rays exhibiting elegant curved series of 

 dots; diam. 1-180". Found fossil in Mary- 

 land. 



BIBL. Ehr., Ber. d. Berl. Akad. 1844. 



ASTEROMA, D.C. A genus of Sphae- 

 ronemei (Coniomycetous Fungi) growing 

 upon leaves and stalks, forming very minute, 

 slightly prominent spots, more or less con- 

 fluent, seated on more or less distinct 

 radiating filaments. Species : 



1. A. reticulatum, D.C. Dothidea reti- 

 culata, Fr., Corda. On decaying leaves of 



Convallaria. Hooker, Brit. Flora, ii. part 2. 

 p. 288. 



2. A, Ulmi, Klotsch. On elm-leaves. 

 Hooker, Brit. Flora, ii. part 2. p. 289. 



3. A. Prunella, Purt. On green leaves 

 of Prunella vulgaris. Hooker, Brit. Fl. ii. 

 part 2. p. 289. 



4. A. Padi, Grev. On Prunus Padus. 

 Hooker, Brit. Fl. ii. pt. 2. p. 289 ; Berkeley, 

 Ann. Nat. Hist. vi. 364. pi. 11. fig. 4. 



5. A. ROSCB, Lib. On rose-leaves. Libert, 

 Trans. Linn. Soc. of Paris, 1826; Berkeley, 

 Ann. Nat. Hist. vi. p. 364. pi. 11. fig. 5. * 



6. A. lobes, Berk. On poplar leaves. 

 Berkeley, Ann. Nat. Hist. vi. 364. pi. 11. 

 fig. 6. 



BIBL. As above. 



ASTEROMPHALOS, Ehr. A genus of 

 Diatomaceae. 



Char. Frustules single, equally bivalve, 

 circular; valves marked with alternate rays 

 forming a double star ; central rays (imper- 

 fect septa) not reaching the margin, two of 

 them parallel, the others diverging; marginal 

 rays broader, smooth, flat, one being absent 

 or so far obsolete that the two central rays 

 enclosing it become parallel. 



The species occur in the Antarctic ocean ; 

 the diameter of the valves lies between 1-900 

 and 1-47". They are distinguished by the 

 number and direction of the central rays. 



A. Darwinii. Central rays five, flexuous. 



A. Hookerii (PI. 19. fig. 2). Central rays 

 six, marginal five, straight. 



A. Rossii. Rays six, inflexed. 



A. Buchii. Rays six, straight. 



A. Beaumontii. Rays seven, inflexed. 



A. Humboldtii. Rays eight, straight. 



A. Cuvierii. Rays nine, straight. 



BIBL. Ehr., Ber. d. Berl. Akad. 1844. 



ASTEROPHORA, Dittm. A genus of 

 Sepedoniei (Hyphomycetous Fungi), com- 

 posed of minute fibrous plants, growing 

 parasitically upon dry blackened Agarics, 

 deriving their name from the angular, some- 

 what stellate spores. Two British species 

 are described : 



1. A. agaricoides, Fr. Stipe solid, 1" 

 high, 1'" or more thick, villous, bearing a 

 head, at first hemispherical, then plane, about 

 1-2" wide, at first covered by a white fuga- 

 cious tomentum, with lamellae underneath ; 

 spores 6-angled. On decaying Agarics (A. 

 adustus, piperatus), in autumn, gregarious. 

 A. Ly coper dioides, Dittm. SturmDeutsch. Fl. 



2. A. Ly coper dioides. Stipe 1" high or 

 obsolete; head hemispherical or globose, 

 without lamellae beneath; spores 5-6-angled. 



