ISOETACE^. a 



covering the sporangia. Macrospores with a crustaceous white 

 integument, tuberculate, with the blunt tubercles coalescing into 

 ridges. Microspores tuberculate. 



On damp spots in sandy pastures near the sea, L'Ancresse, common 

 in the north of Guernsey. Discovered by Mr. George Wolsey, in 



June, 1860. 



Channel Islands. Perennial. Summer. 



Corm in the Guernsey specimens I have seen about the size of a 

 pea, enclosed in a kind of husk formed by the greatly hardened 

 persistent bases of the former leaves, until it attains a bulk about 

 that of a hazel-nut. The leaf scales or phyllopodia are l inch long, 

 concave, pitchy black, the uppermost ones terminated by 3 teeth not 

 above y^h inch long, and often shorter. The lower scales are in a 

 decaying state, and have the teeth broken off; and sometimes the 

 whole of the scales begin to decay as soon as they are matured by 

 the deposition in them of dark coloured tissue. Leaves 1|- to 2| inches 

 long, deep dull green, something like those of Scilla autumnalis, 

 strongly recurved, flattish above, and acutely convex beneath, so as to 

 have a trigonous section, pellucid towards the base, which is greatly 

 dilated over the sporangia, which are about the size of grains of 

 pearl barley, and concealed by the velum. On the back of the pale 

 enlarged leaf-base there is a band covered with small tubercles 

 extending as far as the sporangium does. Macrospores much smaller 

 than those of I. lacustris, and with much less prominent tubercles 

 than even in I. eu-lacustris, and forming beaded lines, from their bases 

 coalescing. 



The above description is not that of the typical I. Hystrix. 

 (I. Hystrix forma loricata, Eabenb. 1. c. No. 101), which has per- 

 sistent scales terminated by lateral spines \ or even J inch long, with 

 a short intermediate tooth, and a bulb from the size of a hazel-nut to 

 that of a walnut. 



The Jersey plant agrees well with I. Hystrix forma desquamata 

 subinermis of A. Braun, Eabenh. 1. c. Nos. 102 and 103 b. 



Spin?/ Quillwort. 



ORDER XCL— SELAGINELLACEiE. 



Moss-like herbs or small shrubs with dichotomous or branched stems 

 and minute entire or serrulate or denticulate leaves, either equal and 

 regularly disposed round the stem, or bifarious and unequal, two being 

 larger than the others and diverging right and left from the stem, while 

 the smaller leaves are adpressed to it. Sporangia of two kinds, macro- 

 sporangia and microsporangia, which are produced in the axils of 



VOL. XII. c 



