TAXONOMY OF THE PILOBOLIDAE 205 



(carotin) than its allies ; but there has been in most cases con- 

 siderable doubt whether the plants entered under this name were 

 anything but forms of P. crystallinus. The chief points which are 

 supposed to characterise the species are the smallness of the spores 

 and of the sporangium. The " dew-drops " which are implied in 

 the name roridus are to be found in suitable circumstances in equal 

 abundance on other species. It tends to excite our suspicions 

 when we find authors recording the occurrence of P. roridus in 

 company with P. crystallinus. 

 Illustration : Fig. 101. 



4. Pilobolus Kleinii van Tiegh. Trois. Mem. in Ann. Sci. Nat. 

 ser. 6, vol. iv, pp. 337-8, pi. 10, f. 6-10 (1876), repeated from Bull. 

 Soc. Bot. Fr. vol. xxii, pp. 282-3 (1875). Grove, Pilobolidae, p. 335, 

 pi. 4, f. 1-8, 10-13, and in Journ. Bot. 1884, p. 131, pi. 245, f. 4. 

 Sacc. Syll. vii. 185. Bainier, Etude, p. 43, pi. 2, f. 14, 15. Palla, 

 I.e. p. 399. 



P. roridus Carrey, in Journ. Linn. Soc. Lend. Bot. vol. i, 

 pp. 162-7, pi. 2, f. 1-10 (1857). Not M. roridus Bolton. 



P. crystallinus Klein, Zur Kenntyiiss des Pilohol. in Jahrb. f. wiss. 

 Bot. vol. viii, p. 360, pi. 23-7, f. 1-52. Brefekl, Botan. Untersuch. 

 part 4, p. 70, pi. 4, f. 15. Zopf, Z%ir Kcnntniss der Infectionskrank- 

 heiten, p. 354. Not of Tode. 



P. Kleinii var. minor Dewevre, in Grevillea, vol. xxii, p. 74 (only 

 1 mm. high). 



Sporangiophore 2-5 mm. high^ varying up to 10-12 mm. high, 

 rising singly from a turnip-shaped trophocyst which is often buried 

 in the substratum. Subsporangial swelling obovoid or subellipsoid, 

 400-800 y. high. Sporangium black, more or less depressed or sub- 

 globose, about two-thirds as wide as the swelling to nearly as 

 wide ; columella sometimes with a faint blackish tinge, generally 

 colourless, broadly conical below, but occasionally narrowed in the 

 middle so that the apex resembles a papilla ; spores in varying 

 shades of orange-yellow, ellipsoid, 11-20 x 6-10 \j., with a thin 

 smooth colourless cell- wall. 



Zygospores thick-walled, spherical, nearly smooth, about 200 [i 

 diani. (Zopf, I.e. pi. 6, f. 8-19). 



