( 209 ) 



t^ulikc (lie Spluwrellae and Lcptothnna it lias nol tlic appcai-ance 

 of small specks bul of raised black spols (Figs. 1, 2 and 3) which 

 are spread in llie grooves between the nerves and have a lenglh 

 of 1 — 4 and a breadth of '/.^ nnn. 



FucKEL described the fungns first under the name oi Myrotlwcium 

 Tijphae (Symb. 364), in the following words : "Peridiis heniisphaericis, 

 oblongis, V2 lineam lo]igis, aterrimis ; conidiis oblongo-ovatis, nli-inique 

 obtnsis, siniplicibns, bignttnlatis, J8X6/j, pallide fiiscis," and gave 

 a not (juite satisfactory picture of a conidiuni in Fig. 21 of Plate 1. 



He was succeeded by SACfARDO (Syllabus TV, 745), who agreed 

 with his predecessor that the fungus belongs to the Tuberculariaceae, 

 l)ut nevertheless removed it to the genus f/i//i/<'noj)sis, on accoujit 

 of the spore-bed (s]iorodocliium) of Myrothecium being surrounded 

 by a circle of fringes, which is not the case with Hijmeiiopsi.s. 



In a very successful drawing by Mr. i). .). KoNiN(i of a \'ertical 

 section of Hijmenopsis Typluie, (Plate 2), the structure of the fungus 

 is excellently seen, much better than in other pictures, also of other 

 species of the same genus. 



Where the black disks or specks rise above the surface of Ihe 

 leaf-sheaths ;Figs. 1, 2 and 3), one does not lind, as Fuckel writes, 

 a '^peritliecium" (i.e. a more or less completely occluded fruit-body), 

 but a globular assemblage of reproductive cells or conidia (Fig. 4 .s\.s-.), 

 covered by the cuticle and produced by a layer of peculiarly shaped 

 sporophores (Fig. 4 ,i'.), collectively called stroma or fruit-bed. Under 

 this stroma Ihe epidermis is found (Fig. 4 0.): a layer easily recog- 

 nisable by the width of its cells. It deserves to be mentioned that 

 the black colour of the prominent little disks (Figs. 1, 2 and 3) nnist 

 not be ascribed to the colourless cuticle (r), nor to the coloui-less 

 epidermis {0), but oidy to the couidia (Fig. 5 y) which have been 

 left uneoloured, however, in Fig. 5, in order not to make the picture 

 too full. 



One of the most im|)ortaut Figures of Plate 2 is Fig. 5. At ,r it 

 shows the favoured club-shaped threads or basidia, whose task is 

 the production of the conidia; these latter, let free by their bearers, 

 being seen in their neighbourhood in a free condition (//). The conidia 

 have an elongated, cylindrical shape, are more or less asymmetrical 

 or curved, rounded at both ends, somewhat more transparent al Ihe 

 base and of the grey colour of mice. (Sacc. Chromotaxia, pi. 1, Fig. 3j. 

 They contain 2 — 4 consecutive vacuoles each and have a length of 

 about 10 and a breadth of about 4 fi. 



Comparing the Figures of Plates I and 11, one might get the 

 impression that u\ Ihe Figures 2 and 3 of Plate I a perithecium is 



