176 THE JOURNAL OF BOTANY 



M 



tensen in Bot. Tidsskr. x. 200 (1878). In describing the type our 

 British floras say, " peduncle about as long as the spike," or 

 "peduncle very short"; though Hooker & Arnott (Brit. Fl. ed. 8, 

 480 (I860)) remark, "occasionally the peduncle is double the length 

 of the spike." In the var. fluvialis the peduncles are sometimes 

 2£ in. long. In the original description of the species in Rohlings 

 Deutschl. Fl. i. 855 (1823), the peduncle is given as short, " about 

 as long as the spike." It is likely that Fries's var. lacustris (Herb. 

 Norm. v. no. 81 (c. 1840), Summ. Veg. Scan. 68 (1846)) is the 

 same as fluvialis, as he speaks in his Nov. Fl. Suec. 48 (1828) of a 

 form occurring in deep lakes, with the stems elongated (two feet 

 long), and with more slender stems than the type. Ascherson & 

 Graebner do not mention either of these forms. Chamisso in 

 Linnaa, ii. 179 (1827) describes a "forma elougata " with a stem 

 three feet long in deep water, but no mention is made of the length 

 of the peduncle. 



SYNOPSIS OF 

 THE ORDERS, GENERA, AND SPECIES OF MYCETOZOA. 



By A. and G. Lister. 



A considerable number of new species of Mycetozoa have been 

 recorded since the publication of the British Museum Catalogue in 

 1894. Most of these have been described or referred to in this 

 Journal, and the list now offered includes all those that have come 

 under our observation up to the present time ; it is, however, clearly 

 to be understood that it comprises only those species which we have 

 personally examined. With three or four exceptions they are all 

 represented in the British Museum Collection. 



The synopsis of the orders and genera in the British Museum 

 Catalogue and that in the Guide to the British Mycetozoa are pre- 

 ceded by introductions in which the technical terms are explained ; 

 we hope that either of these introductions will serve to elucidate 

 the terms used on the present occasion. 



The colour of the spores is described as seen with transmitted 

 light under a magnifying power of 600 diameters. 



The bibliography at the end refers to the additions and altera- 

 tions which we have seen reason to adopt since the publication of 

 the Catalogue. The species of which there are figures in the papers 

 referred to are marked by an asterisk after the reference-number. 



Subclass I. — Exospobe^e. Spores developed outside a sporophore. 



Order I. — CERATioMYXACEiE. Sporophore membranous, 

 branched ; spores white, borne singly on filiform stalks 

 arising from the areolated sporophore. 1. Ceratiomyxa. 



Subclass II. — Endospore^;. Spores developed inside a sporangium. 

 Cohort I. — Amaurosporales. Spores violet-brown or purplish 



