rODOCORYNE. 



[ GIO ] 



PODOSPIIEXIA. 



having two or four pores, throng-li wliicli 

 the internal membrane is protruded in ger- 

 mination. 



Fig. 589. 



Fig. 690, 



Podisoma Juniperi. 



Fig. .589. Branch of Juniper with clavate fructification 

 protruded from beneath the bark. Nat. size. 



Fig. 590. Vertical section through a fruit, sliowing 

 the fllamenta terminating in bilocular spores. Magnified 

 50 diameters. 



Four species are descrihed as British : P. 

 Juniperi-comimmis, P. Jun-sahince, P.folii- 

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

 P. fuscum on Pinns halepensis and oxy- 

 cednis. 



It has been supposed, but perhaps -with- 

 out sufficient grounds, that the Podisoma 

 of Savine is a condition of Rastelia cancel- 

 lata. 



PODOCOR'YNE, Sars. — A genus of 

 Hydroid Zoophytes. 2 species j on stones 

 and shells, deep water. 



BiBL. Sars, Fmin. Lift. Now. i, 4, t. i. ; 

 AUman, Ami. N. H. 1859, 1864 ; Ilincks, 

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



1871. 



PODOCOPtYN'IDyE.— 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 Conjnopsis. 



BiBL,. Hincks, Hyd. Zooph. 27. 



PODOCY'ATHUS,Kt.— LikePof/op/^T/o, 

 hut with two kinds of tentacles, prehensile 

 and suctorial. P. diadema, marine, length 

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



PODOCYS'TIS, Ktz.— A genus of Dia- 

 tomacete, Cohort Surirelleaj. 



Char. Frustules sessile, cuneate ; valves 

 convex, obovate, with a median line, trans- 

 verse continuous, and intermediate granular 

 strife. 



P. americana, Bailey (PI. 51. fi^. 7). 

 The only species ; marine = P. adrintica, 

 'Kiz.= Doryphora elcyans, Roper. 



BiBL, Bailey, Smith. Contr. 1854 ; Ktz. 



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

 Aly. i. 60. 



PODOCYS'TIS, hiy. = 3Ielampsora. See 

 Uredinei. 



PODODIS'CUS, Kg.— A genus ofDia- 

 tomaceae. 



Cliar, Frustules single or concatenate, 

 with a marginal stalk ; valves circular, con- 

 vex. Marine. No markings visible under 

 ordinary illumination. 



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

 elongate, weak. Diameter 1-840", 

 BiBL. Kiitz. Baeill. 51 ; Sp. Aly. 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.fxa (PI. .30. fig. 5, a k b). 



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

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

 Jahrh. 1875. 



PODOSI'RA, Ehr.— A genus of Diato- 

 macefB. 



Cliar. Frustides 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. Montaynei (Melosira ylohifera, Ralfs), 

 Frustules usually .2 ; hoops striate, Diam, 

 1-600", 



P. maculata. Smith, Diat. 

 P. compressa, West, Prifch. Inf. 815. 

 P. I(^ris, Gregorv, Mic. Jn. vii. 85. 

 BiBL. Kiitz. Sjp. Alg. 26; Smith, Br. 

 Diat. ii. 53 ; Rabenh. Ah), i. 37. 



PODOSPHE'NIA, Ehr.— A genus of 

 Diatomacese. 



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 strise, 

 but no nodules. Marine. 



The strife consist of rows of dots, some- 

 times distinct by ordinaiy illumination, at 

 others not so. 



P. Ehrenheryii (PI. 17. fig. 17). Frus- 

 tules truncate at the end in front view ; 

 valves somewhat acute at the ends ; length 

 1-240". 



P. Lynyhypi. Fr. truncate in front view ; 

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



