Observations on the Occurrence of the Prothallia of Lycopodium inundatum

Gametophytes and Subgeneric Concepts in Lycopodium

“…The details of the presumed L. jlabelliiorme archegonium (Freeberg and Wetmore, 1957) show the outer tiers of neck cells sloughed off. This condition is similar to the condition described for L. cernuum (Treub, 1884) and L. inundatum (Goebel, 1887;Bruce, 1972). Indeed, the resemblance is strengthened by the presence of thickening in the walls of the lower tier of neck cells apparent in the photograph of the presumed 1 Structural details of the wild gametophytes of L.…”

“…In the course of studying certain anatomical features of Lycopodium, mucilage canals of two distinct types were found in various members of the genus (Bruce, 1976). One type, the basal canal, is restricted to the strobilus where it occurs in the sporophylls and outer cortex of the strobilar axis.…”

“…With this in mind, the number of features of value in delimiting groups in Lycopodium is considerably increased. Rothmaler (1944), Chowdhury (1937), Boivin (1950), Wilce (1972Wilce ( ), 011gaard (1975, Bruce (1976), among others, have contributed useful information. This and other information is summarized in Table 1.…”

“…jlabelliiorme archegonium. This is pointed out specifically by Treub (1884) for L. cernuum, and this condition can also be observed in L. inundatum (Bruce, 1972). It is not known, however, to occur in L. selago or in any of the described materials of L. complanatum. 5.…”

Are Lycopods With High Chromosome Numbers Ancient Polyploids?

“…In other homosporous pteridophytes genetic analyses have proven to be straightforward because ofthe ease with which individual gametophytes can be grown and examined electrophoretically (Gastony andGottlieb, 1982, 1985;Haufler andSoltis, 1984, 1986;Soltis, 1986). However, the gametophytes of only a few species of lycopods have been reported from nature, and even fewer have been cultured successfully (Freeberg and Wetmore, 1957;Bierhorst, 1971;Bruce, 1972Bruce, , 1976Whittier, 1977;Bold et a1., 1986). To facilitate genetic interpretation, we therefore analyzed large numbers of individuals from several populations for each species.…”