170 TUK JOUKXAL OF IJOl'AXl' 



Tbemelltxe.e. 



ACHEOOMYCES Boil. 



A genus of the Tremellineie, growing on bark, erunipent and 

 s'uiiuVdtiug a jlfj/xospo?'/nm. Hvplne very long and branched ; conidia 

 one-celled, pallid or colourless. 



Though looking, when dry, exacth' like a Myxosporium, it is 

 easily distinguished not only by its long hyplne, but also by the fact 

 that, when soaked in water, it swells up enormously and becomes 

 tremelloid. 



376. AcirROo:\rTCES carpixeus, sp. n. 



Pustulis madidis maxime intumescentibus, albidis, dein luteo- 

 aurantiacis, arescentibus nigris, pulvinatis, |-1^ mm. latis, erumpen- 

 tibus, peridermii laciniis cinctis ; strato basali obscurato, proliferali 

 luteolo, ex hyphis prailongis copiosissimis fasciculatis valde ramosis 

 oleosis vel guttulatis con^^tante ; ramulis ca. 2^ ^ crassis, specie saltem 

 septatis, raro dichotomis, superne obtusatis v. acutatis, s})oras et apice 

 et ad latera gerentibus. Sporis (conidiis) maxime ludentibus, globu- 

 losis vel ovalibus vel oblongatis, rectis v. subinde curvulis, raro guttu- 

 latis, utrinque rotundatis, usque 7-8x2^-3^. (Fig. 16.) 



Hah. in ramis emortius Carpini Betuli, Edgbaston, Apr.-Jun. 

 1921. 



Mixed with these pustules were smaller (? younger) ones in which 

 the colourless spores were acute at the ends, su1)f usoid, 6-7 X 2 /x ; 

 sporophores narrower, less branched, more guttulate, and acute at the 

 ti])s. 



This species is evidently a close ally of Achroomyces tnmidus Bon. 

 and A. pubescens Kiess. The size of the spores of A. pnhescens is 

 given as about 25-32 X 5 /x, those of A. tuniidiis as 16-20 x3-3|^. 

 All three belong to the Tremelline?e as conidial stages, possibly of 

 l^Iafygloea. Plafyfjloea efusa has been recorded as liritish by Miss 

 E. M. Wakefield in Trans. Brit. Myc. Soc. vi. 138, on "a fallen 

 branch," Weybridge. 



Saccardo listed under M^.vospor turn (though with hesitation) both 

 the species of Achroomyces mentioned. A. p>iihesce)is. on Tilia, is 

 now considered to be :=PIc(fyf/Icea nigricans Schrot. (Pilz. Schles. i. 

 384) = Tachaphantium Tilice Bref. (Untersuch. vii. 78, plate) ; 

 von Hohnel (Annal. Mycol. 1901^, ii. 271) called it Aclii^oomyces 

 TilicB (Lasch) v. Holin., because he considered it to be what Lasch 

 named 8tictis TilicB (Bot. Zeit. 1845, iii. 66). Now there is a 

 Sficfis Betidi Fr, (Sj^st. Myc. p. 193) which was supposed to have 

 a variety nigrescens on Tilia ; it is conceivable, though hardly likely, 

 that this species of Fries is, in part, A. carpi neus. In passing, it may 

 be remarked that continental authors continually refer to Greville 

 (Seott. Crypt. Flor. t. 206) as figuring this fungus of Fries under 

 the name Cryptomyces Betuli {cf. Behm, Discom. ]>. 136), whereas 

 tlie fungus on t. 206 is there called Cryptomyces JVauchii and is on 

 willow! GreviUe never figured C. Betuli. 



ASCOMYCETES. 



377. Cte.vomyces serratus Eidam in Cohn's Beitr. z. Biol. 1880, 

 iii. 274. 



