STILBUM. 443 



Fam. III. STILBEAE. 

 Series I. Hyalostilbeae. Sacc. 



Sect. 1. Amerosporeae. Sacc. 

 STILBUM. Tode. (figs. 20-22, p. 442.) 



Stroma subterete, usually elongated and stem-like, com- 

 posed of agglutinated hyphae that become free above and 

 form, a more or less swollen head ; conidia minute, con- 

 tinuous, borne on the tips of the hyphae forming the head, 

 at first involved in mucus. 



Stilbum, Tode, Fung. Mechl., i. p. 10 ; emended by Sac- 

 cardo in Mich., ii. p. 32 ; Sacc., Syll., iv. p. 564. 



The distinct, simple or branched stem bearing a single 

 head, and the conidia involved in mucus characterise the 

 genus. Small fungi, rarely exceeding ^ of an inch in 

 height. 



Stilbum orbiculare. B. & Br. 



Forming white patches an inch or more in diameter, 

 springing from a white, thin, pulverulent stratum, stem 

 cylindrical, tomentose, often with a torn frill-like structure 

 at the apex ; head globose ; conidia cylindrical, 5 x 2 p.. 



Stilbum orbiculare, B. & Br., Ann. Sci. Nat., n. 1714 ; Sacc., 

 Syll., iv. n. 2676. 



On Lindbladia effusa. 



fungus; Fig. 10, Epicoccum purpurascens, section of; Fig. 11, coni- 

 diuin of same; Fig. 12, Endodesmia glauca; Fig. 13, Bactridium 

 helvellae, spore of; Fig. 14, Fusarium solani ; Fig. 15, Graphium 

 subulatum ; Fig. 16, Isaria citrina, and portion of a branch showing 

 origin of conidia; Fig. 17, Periola tamentosa ; Fig. 18, Hymenvla 

 rubella ; Fig. 19, Sporocybe byssoides ; Fig. 20, Stilbum citrinelluin; 

 Fig. 21, section of head ot same, showing it to consist of hyphae spreading 

 from the stem ; Fig. 22, hyphae bearing conidia, from head of tame ; 

 Fig. 23, Ceratium hydnoides ; Fig. 24, Tubercularia euonymi ; section of 

 fungus and curved condiophore ; Fig. 25, Cylindrocolla. urticae; 

 Fig. 26, lllosporium roteum; Fig. 27, Fusarium betae ; Fig. 28, Spha- 

 celia segetum ; Fig. 29, Helicotporium ramosum. (All the figures are 

 highly magnified.) 



