STRIGULA. 



[ 622 ] 



STYLOSPORES. 



one angle, depressed, tabulate ; with longi- 

 tudinal, uninterrupted vittae, apparently 

 thickened at each end. Marine. 



The vittae appear as dark lines ; no trans- 

 verse striae are visible under ordinary illumi- 

 nation. 



S. unipunctata (PL 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 Striatelleee (DIATOMACE^E, p. 205). 



BIBL. Kiitzing, Eacill. 125, Sp. Alg. 114. 



STRIGULA, Fries. A genus of Lim- 

 borieae (Angiocarpous Lichens), containing 

 one British species, S. Babingtonii, growing 

 on the leaves of box and other evergreens ; 

 the thallus is subepidermal, the asci contain 

 eight, cymbiform, triseptate spores. 



BIBL. Leighton, Brit. Angioc. Lick. p. 70. 

 pl.30. 4; Berkeley, Eng. .Bof.Supp. pi. 2957. 



STRONTIA OR STRONTIAN. The cry- 

 stals of the sulphate of this earthy base are 

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

 those of the sulphates of baryta and lime. 



STRUTHIOPTE- F - 71f - 



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. Sir. 

 germanica (fig. 715) 

 is of large size, and 

 the fertile fronds, di- 

 stinct from the sterile, _ 

 if cursorily examined, struthiopteris germanica . 

 might lead to the re- Portion of a pinna w j t h the 



ference of this plant unrolled margins covering 



to the OsmundacejB the sori. 

 or"Flowering-ferns." Magnified 40 diameter8 ' 



STRYCHNINE, or STRYCHNIA. See 

 ALKALOIDS, p. 25. 



STYLOBIBLIUM, Ehr. A genus of 

 fossil Diatomaceae. 



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 Ehrenberg nor Kiitzing can be relied on 

 for distinguishing a perforation, as evidenced 

 by 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. Eerl. Akad. 

 1845 ; id. Mikrogeologie, &c.\ 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. (PL 24. 

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

 end, flat, oblong, slightly constricted in the 

 middle, dilated at the oblique fore-part. 

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



S. pustulata = Kerona pustul. D. (PL 24. 

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

 a median ventral band of hooks. Aquatic ; 

 length 1-144". 



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

 elliptic-oblong, hooks aggregated into an 

 anterior heap; no setae. Aquatic; length 

 1-290 to 1-220". 



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

 ceolate, pale green, obtuse at the ends; 

 ventral surface flat ; hooks acervate near the 

 mouth ; styles none. Aquatic ; length 

 1-140 to 1-120". 



Two other species. 



BIBL. Ehrenberg, In/us. 370; Stein, 

 Infus. 172. 



STYLOSPORES. 

 Stalked spores 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. 716) (see Stylospores of Pestalozzia. 

 SPORES). Magnified 200 diameters. 



Fig. 716. 



