370 CONTRIBUTIONS PROM ill! NATIONAL HERBARIUM. 



GOMPHONEMA C Ag. 



\. -i Ug. 15. 1824. Pritch. Hist. [nfus ed. I. ss '> 1861, 

 \\ Smith, Synop. Brit l>i.«i 1: 77. j L853. Rabh. Fl Bur. Ug I: 



oop. 122. , 1881 l ■■■ at Diat. 21 - I 



L896 D< r mm. Syll. Ug. 2: II 1 '. L891. Brun, Diat. Alp. 

 Henf Mi.r Diet. ed. 3. 346. pi. 1 875. Cleve, Si Vet. Akad Band] 



178 1894, char emend. 



\_' in pari ; Ehrenb. [nfus. 208. pi. U f 

 a Ehrenb. PhyB. Abh. Akad. Wiss. Berl. 1841: 102. pi 3 It. :. TV, 

 f. i 1843 Pritch. Hist. [nfus. ed. I. B92. L861. Km/. Bacill. 88. pi. 

 L844. 



u.ihi Km/. Bacill. B3. L84 I. 

 .phnn.lhi Rabh. Sussw. Diat. 61. ///. 9./. / 5. 18 



I leve, >\ . Vet. Akad. Handl. 26-': ::;. 1894. 

 inadequate ground for constituting ;> genua namely, the matter of its being 

 provided with a gelatinous attachment or being free discussed under the genus 

 Cocconema Ehrenb., i- responsible for Borne of ili«- above Bynonyms. Thus < i< >in ]>ln ►- 

 n. ll.i Rabh. i- the form of Gomphonema C. Ag. thai is found in gelatinous m 

 while Sphenella Kin/.. i< made up of the forms thai are free. Heiberg Bhoved thai 

 both forms occur in the same Bpecies. Cleve's Gomphoneia i- based on a fine line near 

 ih.- margin and a Blight difference in the punctation of the costae. Cleve i- consist- 

 ent, in thai he >>i« -a k- up other genera, as tfavicula, on just Buch grounds; but, a- i- 

 Bhown under that name, the distinctions are i"<> trivial to separate generically forms 

 thai are otherwise bo nearly related. The un-niis Rhoicosphenia Grun. is Bometimes 

 Bpoken of a- differing bu1 slightly from this genus. Ii is much nearer to Achnanthes 

 Bory by reason of the totally unlike valves of the frustule. Gomphonema is closer 

 to Cocconema Ehrenb. than to any other valid genus. 



Gomphonema herculeanum Ehrenb. Ber. Akad. Wiss. Berl. 1845:78. 1846; Mikrog. 

 pl.SlA f.9,pl.S5A. 17/ /'.///.;. I s:>l. Van Heur. Synop. pi tS.f. t. Pritch. 

 Hist. [nfus. -1. I. 890. L861. !>-■ Toni, Syll. Alg. 2: 120. L891. 

 Gomphoneisherculeana Cleve, Sv. Vet. Akad. Handl. 26-: ;:;. [894. Schmidt, Alias 



pi. 215. f. ; /;. L899; pi ISS.f. t :. [902. 

 De T<mi gives as reference II. I.. Smith's type no. 177. Smith labels it "Gompho- 

 nema capitatum herculaneum" nol herculeanum). It is an unimportanl variety of 

 that species and does not at all resemble this one. 

 Found at Btation 3694H, Okhotsk Sea. 



Gomphonema mammilla Ehrenb. Aiikrog. pi..::. II. f. 10. L854; Thy-. Abh. Akad. 

 Wiss. Berl. 1870: 56. L871. Van II. ur. Synop. /</. IS. f. 1. 1881. Ralfs in 

 Pritch. Hist. [nfus. ed. I. 890. [861. 

 Gomphonns mamilla Cleve, Sv. Vet. Akad. Handl. 26 2 : 73. 1894. 

 Gomphonema oregonicum Ehrenb. Mikrog. pl.S7. Iff 12 IS. 1854? 

 Gomphonema oregonicum var.?) maximum Grun.; Van Heur. Synop. pi /.;. f. ... 



L881 

 I .mi not satisfied of the specific identity of Ehrenberg's G. mammilla and G. oregoni- 

 cum. \- Ralfs points out, there are some considerable differences. It is, however, 

 doubtful n' they can be held separate. I do not agree with !>•• Toni in looking upon 

 all tli<- above as Bynonymous with G. herculeanum Ehrenb. It should be here noted 

 that tip- figure of Van Heurck i- misleading in having an unsymmetrica] curvature of 

 the costae on opposite Bides of the median line. 

 Pound at Btation 2882, off ( Oregon. 



H< ib. Km. Overs. Danske Diat [863. 



