PODOCORYNE. 



[ 610 ] 



PODOSPHEXIA. 



having two or four pores, through which 

 the internal membrane is protruded in ger- 

 mination. 



Fig. 589. 



Fig. 590. 



Podisoma Juniperi. 



Fig. 589. Branch of Juniper with clavate fructification 

 protruded from beneath the bark. Nat. size- 



Fig. 590. Vertical section through a fruit, showing 

 the filaments terminating in bilocular spores. Magnified 

 50 diameters. 



Four species are described as British : P. 

 Juniperi-communis, P. Jun.-sabina, P.folii- 

 colum (on the leaves of J. communis), and 

 P. fuscum on Pinus halepensis and oxy- 

 cedrus. 



It has been supposed, but perhaps with- 

 out sufficient grounds, that the Podisoma 

 of Savine is a condition of Rccstelia cancel- 

 lata. 



PODOCOR'YNE, Sars. A genus of 

 Hydroid Zoophytes. 2 species ; on stones 

 and shells, deep water. 



BIBL. Sars, Faun. Lift. Norv. i, 4, t. i. ; 

 Allman, Ann. N. H. 1859, 1864 ; Hincks, 

 Hyd. Zooph. 27 ; Agassiz, Sea-side Studies, 



1871. 



PODOCORYN'ID^E. A family of Hy- 

 droid Zoophytes. 



Char. Polypes sessile, with a single 

 whorl of filiform tentacles around the base 

 of a conical proboscis ; mouth simple. Gen. : 

 Podocoryne and Corynopsis. 



BIBL. Hincks, Hyd. Zooph. 27. 



PODOC Y' ATHUS, Kt LSkePodophrya, 

 but with two kinds of tentacles, prehensile 

 and suctorial. P. diadema, marine, length 

 1-600". (Kent, Inf. 827.) 



PODOC YS 'TIS, Ktz. A genus of Dia- 

 tomacese, Cohort Surirelleae. 



Char. Frustules sessile, cuneate; valves 

 convex, obovate, with a median line, trans- 

 verse continuous, and intermediate granular 

 strise. 



P. americana, Bailey (PI. 51. fig. 7) 

 The only species ; marine = P. adriatica 

 JLtz.=Doryphora elegans, Roper. 



BIBL. Bailey, Smith. Contr. 1854 j Ktz 



Bac. 62 ; Roper, Mic. Jn. ii. 284 j Rabenht. 

 Alg. i. 60. 



PODOC YS'TIS,L6v. = Melampsora. See 

 UKEDINEI. 



PODODIS'CUS, Kg. A genus of Dia- 

 tom acese. 



Char. Frustules single or concatenate, 

 with a marginal stalk ; valves circular, con- 

 vex. Marine. No markings visible under 

 ordinary illumination. 



P. jamaicensis (PI. 17. fig. 16). Stalk 

 elongate, weak. Diameter 1-840". 

 BIBL. Kiitz. Bacill. 51 ; Sp. Alg. 26. 

 PODOPH'RYA, Ehr. A genus of Aci- 

 netina. 



Char. Suckers simple, capitate, in bun- 

 dles or on the surface, neither on a trunk 

 nor ramified ; body without a shell, pedun- 

 culated. Several species, freshwater and 

 marine; P.fixa (PI. 30. fig. 5, a & b). 



BIBL. Ehr. Inf. 305; Clap, et Lach. Inf. 

 381; Kent, Inf. 813; Gegenbaur, Morph. 

 Jahrb. 1875. 



PODOSI'RA, Ehr. A genus of Diato- 

 maceae. 



Char. Frustules concatenate, with a la- 

 teral stalk; valves circular, punctate, con- 

 vex. Marine. Stalk attached to the centre 

 of the valves. 



P. hormoides (PI. 19. fig. 34). Frustules 

 2 to 6, depressed-spheroidal, connected by 

 isthmi or stalks ; hoops obscurely punctate. 

 Diameter 1-650". 



P. Montagnei (Melosira globifera, Ralfs). 

 Frustules usually 2 ; hoops striate. Diaiii. 

 1-600". 



P. maculata, Smith, Diat. 

 P. compressa, West, Pritch. Inf. 815. 

 P. Items, Gregory, Mic. Jn. vii. 85. 

 BIBL. Kiitz. Sp. Alg. 26; Smith, Br. 

 Diat. ii. 53 ; Rabenh. Alg. i. 37. 



PODOSPHE'NIA, Ehr. A genus of 

 Diatomaceae. 



Char. Frustules attached, sessile, wedge- 

 shaped in front view ; ends indented so as 

 to produce a black line (vitta) in the front 

 view ; valves convex, obovate, with a lon- 

 gitudinal median line and transverse striae, 

 but no nodules. Marine. 



The strise consist of rows of dots, some- 

 times distinct by ordinary illumination, at 

 others not so. 



P. Ehreribergii (PL 17. fig. 17). Frus- 

 tules truncate at the end in front view; 

 valves somewhat acute at the ends ; length 

 1-240". 



P. Lyngbyei. Fr. truncate in front view ; 

 valves rounded at the end ; length 1-350". 



