STKIGULA. 



[ 622 ] 



STYLOSPORES. 



one angle, depressed, tabulate ; with longi- 

 tudinal, uninterrupted vittae, apparently 

 thickened at each end. Marine. 



The vittse appear as dark lines ; no trans- 

 verse striae are visible imder ordinary illumi- 

 nation. 



S. unipunctata (PI. 13. fig. 20). Frustules 

 in front view quadrangular, often broader 

 than long, lateral margins subalate ; valves 

 narrowly lanceolate ; stalk elongate, simple, 

 filiform and thickish. Length of frustules 

 1-450 to 1-280". 



Compare the other genera enumerated 

 under Striatellese (Diatomace^, p. 205). 



Btbl. Kiitzing, B«d/Z. 125, Sp. Alg. 114. 



STRIGULA, Fries.— A genus of Lim- 

 borieae (Angiocarpous Lichens), containing 

 one British species, S. Bahingtonii, growing 

 on the leaves of box and other evergreens ; 

 the thallus is subepidermal, the asci contain 

 eight, cymbiform, triseptate spores. 



"Bibl. Leighton, Brit. Angioc. Lich. p. 70. 

 pi. 30. 4; Berkeley, Eng. Eo^Supp. pi. 2957. 



STRONTIA OR Strontian.— The cry- 

 stals of the sulphate of this earthy base are 

 figured in PI. 6. fig. 18, to contrast with 

 those of the sulphates of baryta and lime. 



STRUTHIOPTE- 

 RIS,Willden.— Age- 

 nus of Polypodieae 

 (Ferns), with the 

 margins of the fertile 

 leaves rolled up so as 

 to conceal the sori 

 which are without a 

 true indusium. Str. 

 germanica (fig. 715) 

 is of large size, and 

 the fertile fronds, di- 

 stinct from the sterile, 



if cursorily examined, stmthiopteris germanica. 

 might lead to the re- Portion of a pinna with the 

 ference of this plant unrolled margins covering 



to the Osmundaceae the sori. 



tr■^^^  c 3J Magnified 40 diameters, 



or rlowermg-ierns. ^ 



STRYCHNINE, or Strychnia. See 

 Alkaloids, p. 25. 



STYLOBIBLIUM, Ehr.— A genus of 

 fossil Diatom ace ffi. 



Char. Frustules circular, single, multi- 

 valve ; valves contiguous, in a single row, 

 like the leaves of a book, the inner ones with 

 a large median aperture (?), the outer not 

 being perforated, but sculptured. 



The structure of the frustules of this ge- 

 nus requires careful examination, as does that 

 of many other of Ehrenberg's genera of fos- 

 sil Diatomaceae. It is uncertain whether the 



so-called inner valves are merely hoops, or 

 the valves of imperfectly separated frustules ; 

 also whether they are perforated or not, for 

 neither EhrenbergnorKiitzingcanbereliedon 

 for distinguishing a perforation, as evidenced 

 b}^ their erroneous description of the struc- 

 ture of the valves of Pinnularia, Gramma- 

 tophora, and many other Diatomaceae. 



Three species are described, occurring in 

 America and Siberia. The sculpturings upon 

 the outer valves consist of radiating or ex- 

 centric curved lines. 



BiBL. Ehrenberg, Ber. d. Berl. Akad. 

 1845 ; id. Mikrogeologie, Sfc; Kiitzing, Sp. 

 Alg. 116. 



STYLONICHIA, Ehr.— A genus of In- 

 fusoria, of the family Oxytrichina. 



Char. Body ciliated, and furnished with 

 styles and hooks. 



In this genus, transverse and longitudinal 

 division, gemmation, and the encysting pro- 

 cess have been observed. 



S. mytilus = Kerona mytilus, D. (PI. 24. 

 figs. 27, 28). Body white, hyaline at each 

 end, flat, oblong, slightly constricted in the 

 middle, dilated at the obhque fore-part. 

 Aquatic; length 1-240 to 1-100". 



aS. pustulata = Kerona pustul. D. (PI. 24. 

 fig. 26). Body white, turbid, oblong, wdth 

 a median ventral band of hooks. Aquatic ; 

 length 1-144". 



S. histrio (PI. 24. fig. 29). Body white, 

 elliptic-oblong, hooks aggregated into an 

 anterior heap ; no setae. Aquatic ; length 

 1-290 to 1-220". 



S. lanceolata (PI. 24. fig. 30). Body lan- 

 ceolate, pale green, obtuse at the ends; 

 ventral surface flat ; hooks acervate near the 

 mouth ; st^ les none. Aquatic ; length 

 1-140 to 1-120". 

 Two other species. 



BiBL. Ehrenberg, Infus. 370; Stein, 

 Infus. 172. 



STYLOSPORES. 

 — Stalked s])ores of 

 Coniomycetous Fun- 

 gi, usually compound 

 or septate, then pro- 

 bably consisting of a 

 row of independent 

 spores connected by 

 an adherent parent- 

 sac, thus, structural- 

 ly, metamorphosed 

 asci ; they are some- 

 times appendaged 



above (fig. 7 16) (see Stylospores of Pestalozzia. 

 Spores). Magnified 200 diameters. 



Fig. 716. 



